Pub Date : 2024-04-18DOI: 10.1007/s13355-024-00873-w
Masaki Masuko, Shingo Kikuta
The small size and extensive polymorphisms of aphids make it difficult to identify larvae and adults solely based on their morphology. Here, we present an identification tool for the developmental stages of Acyrthosiphon pisum (Hemiptera: Aphididae) based on deep learning as a proof of concept. You Only Look Once (YOLO) algorithm is one of the most effective deep learning techniques for object detection. Although several studies have been conducted using deep learning technology for the detection and counting of tiny pests, the type of light source and size of the images were the limiting factors, as training was highly focused on uniform datasets and small insects. One way to overcome this problem is to introduce many types of datasets obtained from various light sources and microscopic magnifications. This strategy minimizes errors and omissions in aphid detection across all developmental stages in aphid individuals to the greatest extent possible. The experimental results showed that our modified YOLOv8 model could obtain over 95.9% and 99% accuracy for mean average precision (mAP) and recall, respectively, under various light sources, such as yellow, white, and natural light, and stereomicroscope magnifications. This study showed an improved accuracy of aphid recognition at all developmental stages. The study presents a novel deep learning model utilizing the YOLO algorithm to identify developmental stages of A. pisum. This model achieves high accuracy across various light sources and magnifications, thereby enhancing aphid biology studies.
{"title":"Image recognition-based deep learning model for identifying the developmental stages of Acyrthosiphon pisum (Hemiptera: Aphididae)","authors":"Masaki Masuko, Shingo Kikuta","doi":"10.1007/s13355-024-00873-w","DOIUrl":"https://doi.org/10.1007/s13355-024-00873-w","url":null,"abstract":"<p>The small size and extensive polymorphisms of aphids make it difficult to identify larvae and adults solely based on their morphology. Here, we present an identification tool for the developmental stages of <i>Acyrthosiphon pisum</i> (Hemiptera: Aphididae) based on deep learning as a proof of concept. You Only Look Once (YOLO) algorithm is one of the most effective deep learning techniques for object detection. Although several studies have been conducted using deep learning technology for the detection and counting of tiny pests, the type of light source and size of the images were the limiting factors, as training was highly focused on uniform datasets and small insects. One way to overcome this problem is to introduce many types of datasets obtained from various light sources and microscopic magnifications. This strategy minimizes errors and omissions in aphid detection across all developmental stages in aphid individuals to the greatest extent possible. The experimental results showed that our modified YOLOv8 model could obtain over 95.9% and 99% accuracy for mean average precision (mAP) and recall, respectively, under various light sources, such as yellow, white, and natural light, and stereomicroscope magnifications. This study showed an improved accuracy of aphid recognition at all developmental stages. The study presents a novel deep learning model utilizing the YOLO algorithm to identify developmental stages of <i>A</i>. <i>pisum</i>. This model achieves high accuracy across various light sources and magnifications, thereby enhancing aphid biology studies.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140628340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-11DOI: 10.1007/s13355-024-00871-y
Consuelo G. Corrales-Maldonado, Irasema Vargas-Arispuro, Rosalva Pérez-Morales, Miguel Ángel Martínez-Téllez, Emmanuel Aispuro-Hernández, Graciela Dolores Ávila-Quezada
Acrobasis nuxvorella Neuzing (Lepidoptera: Pyralidae) is a monophagous pest of Carya illinoinensis (Wangenh) K. Koch, a plant rich in tannins. When the tannins degrade, high concentrations of gallic acid are released, which are harmful to some insects. However, Acrobasis nuxvorella larvae are not affected by feeding on the plant when gallic acid is released. Therefore, it may be expected that Acrobasis nuxvorella larval gut microbiota may produce the enzyme laccase, enabling them to biotransform gallic acid into other useful molecules. Thus, the intestinal content of the insect was recovered. Among 175 bacterial isolates, 8 showed laccase activity in the range of 0.52–3.9 U/µg of protein. The isolates with laccase activity were identified as the Bacillus species: Bacillus pumilus, Bacillus safensis, Bacillus altitudinis, and Bacillus xiamenensis through 16S ribosomal RNA gene sequencing. In addition, the cotA gene coding for the laccase enzyme was found in the genomic DNA of these eight Bacillus isolates.
{"title":"Laccase-producing gut bacteria from the larvae of Acrobasis nuxvorella (Lepidoptera: Pyralidae)","authors":"Consuelo G. Corrales-Maldonado, Irasema Vargas-Arispuro, Rosalva Pérez-Morales, Miguel Ángel Martínez-Téllez, Emmanuel Aispuro-Hernández, Graciela Dolores Ávila-Quezada","doi":"10.1007/s13355-024-00871-y","DOIUrl":"https://doi.org/10.1007/s13355-024-00871-y","url":null,"abstract":"<p><i>Acrobasis nuxvorella</i> Neuzing (Lepidoptera: Pyralidae) is a monophagous pest of <i>Carya illinoinensis</i> (Wangenh) K. Koch, a plant rich in tannins. When the tannins degrade, high concentrations of gallic acid are released, which are harmful to some insects. However, <i>Acrobasis nuxvorella</i> larvae are not affected by feeding on the plant when gallic acid is released. Therefore, it may be expected that <i>Acrobasis nuxvorella</i> larval gut microbiota may produce the enzyme laccase, enabling them to biotransform gallic acid into other useful molecules. Thus, the intestinal content of the insect was recovered. Among 175 bacterial isolates, 8 showed laccase activity in the range of 0.52–3.9 U/µg of protein. The isolates with laccase activity were identified as the <i>Bacillus</i> species: <i>Bacillus pumilus, Bacillus safensis, Bacillus altitudinis</i>, and<i> Bacillus xiamenensis</i> through 16S ribosomal RNA gene sequencing. In addition, the <i>cotA</i> gene coding for the laccase enzyme was found in the genomic DNA of these eight <i>Bacillus</i> isolates.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140574921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-10DOI: 10.1007/s13355-024-00872-x
Haruyuki Nakano, Kohta Toshi, Yuuki Fukushima, Keiji Nakamura
Entoria okinawaensis Shiraki, 1935 (Phasmatodea: Phasmatidae) is a stick insect originally distributed among the subtropical islands of Japan. This species, after introduction into the southernmost regions of Kyushu Island, became established there. After insects were collected for this study from Ibusuki city, Kagoshima prefecture, Japan, their eggs were used for experimentation. Embryonic development was fundamentally temperature dependent. At 25 °C, many eggs hatched approximately 2 months after oviposition. However, hatching was observed continuously until the end of the 240-day experiment. Findings from egg dissection suggest that a small number of eggs arrest development at the early embryonic stages. Fluorescence observation of DAPI-stained eggs reveals that eggs show arrested development at the very attenuated blastoderm period. This study proves the existence of embryonic diapause in E. okinawaensis, although the incidence of diapause eggs is small. If future changes in the incidence and duration of diapause as adaptations to local climate occur, then the domestic-introduced subtropical stick insect might expand its distribution range farther north.
{"title":"Evidence for the existence of embryonic diapause in the domestic-introduced subtropical stick insect, Entoria okinawaensis (Phasmatodea: Phasmatidae)","authors":"Haruyuki Nakano, Kohta Toshi, Yuuki Fukushima, Keiji Nakamura","doi":"10.1007/s13355-024-00872-x","DOIUrl":"https://doi.org/10.1007/s13355-024-00872-x","url":null,"abstract":"<p><i>Entoria okinawaensis</i> Shiraki, 1935 (Phasmatodea: Phasmatidae) is a stick insect originally distributed among the subtropical islands of Japan. This species, after introduction into the southernmost regions of Kyushu Island, became established there. After insects were collected for this study from Ibusuki city, Kagoshima prefecture, Japan, their eggs were used for experimentation. Embryonic development was fundamentally temperature dependent. At 25 °C, many eggs hatched approximately 2 months after oviposition. However, hatching was observed continuously until the end of the 240-day experiment. Findings from egg dissection suggest that a small number of eggs arrest development at the early embryonic stages. Fluorescence observation of DAPI-stained eggs reveals that eggs show arrested development at the very attenuated blastoderm period. This study proves the existence of embryonic diapause in <i>E. okinawaensis</i>, although the incidence of diapause eggs is small. If future changes in the incidence and duration of diapause as adaptations to local climate occur, then the domestic-introduced subtropical stick insect might expand its distribution range farther north.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140574827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.1007/s13355-024-00870-z
Abstract
The challenge of dengue control due to the unavailability of a specific medication stresses the importance of releasing Wolbachia-carrying mosquitoes through vector control programs. This study investigated the sustainability and frequency of Wolbachia in Wolbachia-dengue-carrying mosquitoes in two dengue hotspot localities in Selangor. A modified sticky ovitrap was used to collect adult mosquitoes in two Wolbachia-releasing areas in Selangor, Kelana Puteri and Kelana D'Putera condominiums. All mosquito samples were subjected to PCR using wsp-specific primers for Wolbachia detection. Dengue virus was detected using RT-PCR, followed by multiplex-PCR. Out of the 80 Aedes spp. collected, Ae. aegypti was the most predominant species. More than one-third of Ae. aegypti were positive for Wolbachia, with 22.9% being superinfected with both Wolbachia A and B strains. About 61.4% of the species were uninfected with Wolbachia. Ae. aegypti carrying the Wolbachia A strain was also identified, which has previously never been reported. This strain was similar to the one found naturally in Ae. albopictus. None of the Ae. aegypti and Ae. albopictus were positive for dengue virus. This study could serve as a model for local researchers or health authorities to design and plan an effective field release and monitoring of Wolbachia-infected mosquitoes.
摘要 由于没有特效药物,登革热控制面临挑战,这就强调了通过病媒控制项目释放携带沃尔巴克氏体蚊子的重要性。本研究调查了雪兰莪州两个登革热热点地区携带沃尔巴克氏体蚊子中沃尔巴克氏体的可持续性和频率。研究人员在雪兰莪州的两个沃尔巴克氏体释放区(Kelana Puteri和Kelana D'Putera公寓)使用改良的粘性誘捕器收集成蚊。所有蚊子样本都使用 wsp 特异引物进行 PCR 检测。登革热病毒的检测采用 RT-PCR,然后是多重 PCR。在收集到的 80 种伊蚊中,埃及伊蚊是最主要的种类。超过三分之一的埃及伊蚊对沃尔巴克氏体呈阳性反应,其中 22.9% 的埃及伊蚊同时被沃尔巴克氏体 A 和 B 株超级感染。约 61.4% 的埃及姬蜂未感染沃尔巴克氏体。此外,还发现埃及蚁携带沃尔巴克氏体 A 株,这在以前从未报道过。这种菌株与在白纹伊蚊中自然发现的菌株相似。埃及蚁和白纹伊蚊均未对登革热病毒呈阳性反应。这项研究可作为当地研究人员或卫生当局设计和规划有效的野外释放和监测沃尔巴奇感染蚊子的范例。
{"title":"A study on Wolbachia-dengue-carrying Aedes mosquitoes (diptera: culicidae) focuses on the sustainability and frequency of Wolbachia in high-rise buildings in Selangor, Malaysia","authors":"","doi":"10.1007/s13355-024-00870-z","DOIUrl":"https://doi.org/10.1007/s13355-024-00870-z","url":null,"abstract":"<h3>Abstract</h3> <p>The challenge of dengue control due to the unavailability of a specific medication stresses the importance of releasing <em>Wolbachia</em>-carrying mosquitoes through vector control programs. This study investigated the sustainability and frequency of <em>Wolbachia</em> in <em>Wolbachia</em>-dengue-carrying mosquitoes in two dengue hotspot localities in Selangor. A modified sticky ovitrap was used to collect adult mosquitoes in two <em>Wolbachia</em>-releasing areas in Selangor, Kelana Puteri and Kelana D'Putera condominiums. All mosquito samples were subjected to PCR using wsp-specific primers for <em>Wolbachia</em> detection. Dengue virus was detected using RT-PCR, followed by multiplex-PCR. Out of the 80 <em>Aedes</em> spp. collected<em>, Ae. aegypti</em> was the most predominant species. More than one-third of <em>Ae. aegypti</em> were positive for <em>Wolbachia</em>, with 22.9% being superinfected with both <em>Wolbachia A</em> and <em>B</em> strains. About 61.4% of the species were uninfected with <em>Wolbachia</em>. <em>Ae. aegypti</em> carrying the <em>Wolbachia A</em> strain was also identified, which has previously never been reported. This strain was similar to the one found naturally in <em>Ae. albopictus</em>. None of the <em>Ae. aegypti</em> and <em>Ae. albopictus</em> were positive for dengue virus. This study could serve as a model for local researchers or health authorities to design and plan an effective field release and monitoring of <em>Wolbachia</em>-infected mosquitoes.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140574818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-25DOI: 10.1007/s13355-024-00868-7
Chihiro Himuro, Yusuke Ikegawa
The sterile insect technique (SIT) is a pest control method that releases a large number of sterile pests into the field to inhibit mating between wild pests, ultimately resulting in the eradication of wild pest populations. It has often been discussed whether releasing one sex (mainly males) of sterile insects enhances the pest control efficiency of SIT compared to releasing both sexes (bisexual release). The control efficiency of sterile females may be negatively affected by their release, because sterile males lose the opportunity to mate with wild females. In this study, we investigated whether sterile females have a positive effect on the control efficiency of SIT and whether there is an additive or synergistic effect of releasing both sexes using two weevil species, Cylas formicarius and Euscepes postfasciatus, which are serious pests of the sweet potato Ipomoea batatas and targets of SIT in Okinawa. The results showed that in both species, the reproduction rate of wild pests was significantly suppressed in the case of the sterile female-only release. Interestingly, the most effective method varied between male-only and bisexual release depending on the density of sterile individuals and weevil species. Synergistic effects of both sexes on bisexual release were observed but varied with the density of sterile individuals and weevil species. High-density bisexual release was most effective for the SIT of at least two weevil species.
昆虫不育技术(SIT)是一种害虫控制方法,通过向田间释放大量不育害虫来抑制野生害虫之间的交配,最终达到消灭野生害虫种群的目的。人们经常讨论,释放一种性别(主要是雄性)的不育昆虫是否比释放两种性别(双性释放)的不育昆虫更能提高 SIT 的害虫控制效率。不育雌虫的控制效率可能会受到释放的负面影响,因为不育雄虫失去了与野生雌虫交配的机会。在本研究中,我们利用两种象鼻虫(Cylas formicarius 和 Euscepes postfasciatus)研究了不育雌虫是否会对 SIT 的控制效率产生积极影响,以及释放雌雄两种象鼻虫是否会产生叠加或协同效应。结果表明,在这两种害虫中,只释放不育雌虫的情况下,野生害虫的繁殖率明显受到抑制。有趣的是,根据不育个体密度和象鼻虫种类的不同,只释放雄性和双性释放的最有效方法也不同。观察到雌雄双性释放的协同效应,但随着不育个体密度和象鼻虫种类的变化而变化。高密度双性释放对至少两种象鼻虫的SIT最有效。
{"title":"Do sterile males and females synergistically suppress pests targeted by the sterile insect technique?","authors":"Chihiro Himuro, Yusuke Ikegawa","doi":"10.1007/s13355-024-00868-7","DOIUrl":"https://doi.org/10.1007/s13355-024-00868-7","url":null,"abstract":"<p>The sterile insect technique (SIT) is a pest control method that releases a large number of sterile pests into the field to inhibit mating between wild pests, ultimately resulting in the eradication of wild pest populations. It has often been discussed whether releasing one sex (mainly males) of sterile insects enhances the pest control efficiency of SIT compared to releasing both sexes (bisexual release). The control efficiency of sterile females may be negatively affected by their release, because sterile males lose the opportunity to mate with wild females. In this study, we investigated whether sterile females have a positive effect on the control efficiency of SIT and whether there is an additive or synergistic effect of releasing both sexes using two weevil species, <i>Cylas formicarius</i> and <i>Euscepes postfasciatus,</i> which are serious pests of the sweet potato <i>Ipomoea batatas</i> and targets of SIT in Okinawa. The results showed that in both species, the reproduction rate of wild pests was significantly suppressed in the case of the sterile female-only release. Interestingly, the most effective method varied between male-only and bisexual release depending on the density of sterile individuals and weevil species. Synergistic effects of both sexes on bisexual release were observed but varied with the density of sterile individuals and weevil species. High-density bisexual release was most effective for the SIT of at least two weevil species.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140303008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-23DOI: 10.1007/s13355-024-00869-6
Yuki Mitaka, Kenji Matsuura, Toshiharu Akino
Subterranean termites primarily use decaying wood as both nest material and food, and the worker caste is responsible for searching for new wood. Because brown-rotted wood contains (Z,Z,E)-3,6,8-dodecatrien-1-ol, which is a trail pheromone component in Reticulitermes termites, it is considered that this compound attracts termite workers. However, while the trail pheromone allows passing workers to continue to move along it, it is unlikely to attract them from a distance. Therefore, workers should use other attractants derived from decaying wood as cues to locate it. In this study, we found that an aromatic abietane diterpenoid in termite culture medium made from brown-rotted Japanese red pine (Pinus densiflora) attracted workers of the Japanese subterranean termite Reticulitermes speratus (Kolbe) (Isoptera: Rhinotermitidae). Gas chromatography analyses and behavioral assays revealed that the n-hexane extract of the medium contains dehydroabietic acid, which is a resin component of various conifers, and this compound attracts workers. These results strongly suggest that R. speratus workers mainly use this compound as a cue to locate brown-rotted pinewood in nature. Our study contributes to the understanding of the mechanisms of wood detection in termites.
{"title":"Dehydroabietic acid, an aromatic abietane diterpenoid, attracts termite workers","authors":"Yuki Mitaka, Kenji Matsuura, Toshiharu Akino","doi":"10.1007/s13355-024-00869-6","DOIUrl":"https://doi.org/10.1007/s13355-024-00869-6","url":null,"abstract":"<p>Subterranean termites primarily use decaying wood as both nest material and food, and the worker caste is responsible for searching for new wood. Because brown-rotted wood contains (<i>Z</i>,<i>Z</i>,<i>E</i>)-3,6,8-dodecatrien-1-ol, which is a trail pheromone component in <i>Reticulitermes</i> termites, it is considered that this compound attracts termite workers. However, while the trail pheromone allows passing workers to continue to move along it, it is unlikely to attract them from a distance. Therefore, workers should use other attractants derived from decaying wood as cues to locate it. In this study, we found that an aromatic abietane diterpenoid in termite culture medium made from brown-rotted Japanese red pine (<i>Pinus densiflora</i>) attracted workers of the Japanese subterranean termite <i>Reticulitermes speratus</i> (Kolbe) (Isoptera: Rhinotermitidae). Gas chromatography analyses and behavioral assays revealed that the <i>n</i>-hexane extract of the medium contains dehydroabietic acid, which is a resin component of various conifers, and this compound attracts workers. These results strongly suggest that <i>R</i>. <i>speratus</i> workers mainly use this compound as a cue to locate brown-rotted pinewood in nature. Our study contributes to the understanding of the mechanisms of wood detection in termites.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140203472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-16DOI: 10.1007/s13355-024-00867-8
Ryuji Uesugi, Anna Köneke, Takayuki Sekine, Ken Tabuchi, Annette Herz, Hideto Yoshimura, Elias Böckmann, Takeshi Shimoda, Koukichi Nagasaka
Diversifying crop habitats and controlling arthropod pests by cultivating “secondary plants” alongside a primary crop is a frequently discussed strategy. The effectiveness of using secondary plants to manage pests varies across countries, and is influenced by factors such as the target pest, plant species, experimental design, and climatic conditions. Consequently, we conducted a study investing the impact of intercropping wheat or barley with additional flower strips on controlling aphid pests in white cabbage fields in Japan and Germany.Query Our results in Japan supported the natural enemies hypothesis, leading to a significant reduction in populations of two pest aphids: the green peach aphid, Myzus persicae (Sulzer) (Hemiptera: Aphididae), and the cabbage aphid, Brevicoryne brassicae (L.) (Hemiptera: Aphididae). Furthermore, intercropping and/or flower strips increased the proportions of natural enemies, including hoverfly larvae (Diptera: Syrphidae), ladybirds (Coccinellidae: Coleoptera), and parasitoid wasps (Hymenoptera: Braconidae), relative to the aphids. Hoverfly larvae, due to their high abundance, appeared to be Japan’s most effective aphid suppressors. In contrast, in Germany, intercropping and flower strips did not remarkably suppress aphid populations or enhance the presence of the natural enemies, despite a temporary increase in the population density of hoverfly larvae in intercropping. These disparities between the trials in the two countries may be attributed to variations in regional and local biodiversity. This suggests that using secondary plants for pest control should consider the specificities of local environments.
{"title":"Intercropping and flower strips to enhance natural enemies and control aphids: a comparative study in cabbage fields of Japan and Germany","authors":"Ryuji Uesugi, Anna Köneke, Takayuki Sekine, Ken Tabuchi, Annette Herz, Hideto Yoshimura, Elias Böckmann, Takeshi Shimoda, Koukichi Nagasaka","doi":"10.1007/s13355-024-00867-8","DOIUrl":"https://doi.org/10.1007/s13355-024-00867-8","url":null,"abstract":"<p>Diversifying crop habitats and controlling arthropod pests by cultivating “secondary plants” alongside a primary crop is a frequently discussed strategy. The effectiveness of using secondary plants to manage pests varies across countries, and is influenced by factors such as the target pest, plant species, experimental design, and climatic conditions. Consequently, we conducted a study investing the impact of intercropping wheat or barley with additional flower strips on controlling aphid pests in white cabbage fields in Japan and Germany.Query Our results in Japan supported the natural enemies hypothesis, leading to a significant reduction in populations of two pest aphids: the green peach aphid, <i>Myzus persicae</i> (Sulzer) (Hemiptera: Aphididae), and the cabbage aphid, <i>Brevicoryne brassicae</i> (L.) (Hemiptera: Aphididae). Furthermore, intercropping and/or flower strips increased the proportions of natural enemies, including hoverfly larvae (Diptera: Syrphidae), ladybirds (Coccinellidae: Coleoptera), and parasitoid wasps (Hymenoptera: Braconidae), relative to the aphids. Hoverfly larvae, due to their high abundance, appeared to be Japan’s most effective aphid suppressors. In contrast, in Germany, intercropping and flower strips did not remarkably suppress aphid populations or enhance the presence of the natural enemies, despite a temporary increase in the population density of hoverfly larvae in intercropping. These disparities between the trials in the two countries may be attributed to variations in regional and local biodiversity. This suggests that using secondary plants for pest control should consider the specificities of local environments.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140156550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-16DOI: 10.1007/s13355-024-00866-9
Abstract
Sexual selection is a driving force behind the evolution of insect genitalia morphology. Understanding the functional morphologies of mating-related structures can help explain the evolution of diverse genital morphologies. However, this research is limited to many insect groups, such as the Cerambycidae. We observed the mating process and morphology of mating-related structures of the longhorn beetle Dorysthenes granulosus (Thomson) (Coleoptera: Cerambycidae: Prioninae). Our observations revealed mating behavior characteristics and the functional morphology of genitalia and leg tarsi. The mating process of D. granulosus can be divided into three stages: mounting, insemination, and guarding. The male usually spends 30 min from mounting to control the female, then extends its endophallus and typically inserts it twice into the female reproductive tract. Each insertion lasts for about 40 s. After that, the male begins a long-time insemination, which lasts for two to three minutes. Then, the male withdraws the endophallus and the female reproductive tract secretes a sperm mass. After insemination, some males continue to mount the female for a postcopulatory guarding period, which can last from one to five hours. During copulation, barbs on the surface of the everted male endophallus directly contact the female reproductive tract. The male fore and mid leg tarsi firmly grasp the female elytra, thorax, and abdomen. We discuss the functional morphologies of mating-related structures and the possible reason for male multiple insertions in the Cerambycidae.
{"title":"Mating behavior and functional morphology of genitalia in longhorn beetle Dorysthenes granulosus (Coleoptera: Cerambycidae: Prioninae)","authors":"","doi":"10.1007/s13355-024-00866-9","DOIUrl":"https://doi.org/10.1007/s13355-024-00866-9","url":null,"abstract":"<h3>Abstract</h3> <p>Sexual selection is a driving force behind the evolution of insect genitalia morphology. Understanding the functional morphologies of mating-related structures can help explain the evolution of diverse genital morphologies. However, this research is limited to many insect groups, such as the Cerambycidae. We observed the mating process and morphology of mating-related structures of the longhorn beetle <em>Dorysthenes granulosus</em> (Thomson) (Coleoptera: Cerambycidae: Prioninae). Our observations revealed mating behavior characteristics and the functional morphology of genitalia and leg tarsi. The mating process of <em>D. granulosus</em> can be divided into three stages: mounting, insemination, and guarding. The male usually spends 30 min from mounting to control the female, then extends its endophallus and typically inserts it twice into the female reproductive tract. Each insertion lasts for about 40 s. After that, the male begins a long-time insemination, which lasts for two to three minutes. Then, the male withdraws the endophallus and the female reproductive tract secretes a sperm mass. After insemination, some males continue to mount the female for a postcopulatory guarding period, which can last from one to five hours. During copulation, barbs on the surface of the everted male endophallus directly contact the female reproductive tract. The male fore and mid leg tarsi firmly grasp the female elytra, thorax, and abdomen. We discuss the functional morphologies of mating-related structures and the possible reason for male multiple insertions in the Cerambycidae.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140150387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Although Trichogramma principium (Sugonjaev & Sorokina) (Hymenoptera: Trichogrammatidae) is an effective natural enemy in agricultural ecosystems, its tri-trophic interactions should be investigated in more detail. In the present study, life table parameters of the parasitoid wasp and its population projection were investigated under controlled conditions (25 ± 1 °C, 60 ± 5% RH, and 16:8 h L:D) on Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae). The herbivore was reared using three different cultivars, including Early Urbana, Super Strain-B, and Primo Early, as well as being treated with four nitrogen levels (0, 2100, 3000, and 3900 ppm). Data analysis was performed based on an age-stage two-sex life table by linking the life table parameters and population projection. Results indicated a significant increase in net reproductive rate (R0) and intrinsic rate (r). Therefore, the fertilized treatments were relatively favorable hosts for the herbivore and consequently for the parasitoid wasps than unfertilized treatments. Population projection results also indicated differences in the stage population growth rate, age-staged population fluctuations and the parasitism capacity of the parasitoid. These findings indicated that linking life table and population projection is an appropriate method for clarifying the precise timing and the successful release of natural enemies.
尽管 Trichogramma principium (Sugonjaev & Sorokina) (膜翅目:Trichogrammatidae)是农业生态系统中的有效天敌,但仍需对其三营养互作关系进行更详细的研究。本研究在受控条件下(25 ± 1 °C、60 ± 5%相对湿度、16:8 h L:D)研究了寄生蜂的生命表参数及其种群预测,研究对象为 Helicoverpa armigera (Hübner)(鳞翅目:夜蛾科)。食草动物的饲养采用了三种不同的栽培品种,包括 Early Urbana、Super Strain-B 和 Primo Early,以及四种氮水平(0、2100、3000 和 3900 ppm)。通过将生命表参数与种群预测联系起来,根据年龄阶段双性生命表进行了数据分析。结果表明,净繁殖率(R0)和内在繁殖率(r)都有明显提高。因此,与未施肥处理相比,施肥处理相对有利于食草动物的寄主,从而也有利于寄生蜂的寄主。种群预测结果还表明,寄生蜂的阶段种群增长率、龄期种群波动和寄生能力存在差异。这些研究结果表明,将生命表和种群预测联系起来是明确天敌释放的准确时间和成功释放天敌的适当方法。
{"title":"Influence of fertilized tomato plant cultivars on demography and population projection of Trichogramma principium (Hymenoptera: Trichogrammatidae) on Helicoverpa armigera (Lepidoptera: Noctuidae)","authors":"Gholamhossein Gharekhani, Fereshteh Salehi, Jalal Shirazi","doi":"10.1007/s13355-024-00862-z","DOIUrl":"https://doi.org/10.1007/s13355-024-00862-z","url":null,"abstract":"<p>Although <i>Trichogramma principium</i> (Sugonjaev & Sorokina) (Hymenoptera: Trichogrammatidae) is an effective natural enemy in agricultural ecosystems, its tri-trophic interactions should be investigated in more detail. In the present study, life table parameters of the parasitoid wasp and its population projection were investigated under controlled conditions (25 ± 1 °C, 60 ± 5% RH, and 16:8 h L:D) on <i>Helicoverpa armigera</i> (Hübner) (Lepidoptera: Noctuidae). The herbivore was reared using three different cultivars, including Early Urbana, Super Strain-B, and Primo Early, as well as being treated with four nitrogen levels (0, 2100, 3000, and 3900 ppm). Data analysis was performed based on an age-stage two-sex life table by linking the life table parameters and population projection. Results indicated a significant increase in net reproductive rate (<i>R</i><sub>0</sub>) and intrinsic rate (<i>r</i>). Therefore, the fertilized treatments were relatively favorable hosts for the herbivore and consequently for the parasitoid wasps than unfertilized treatments. Population projection results also indicated differences in the stage population growth rate, age-staged population fluctuations and the parasitism capacity of the parasitoid. These findings indicated that linking life table and population projection is an appropriate method for clarifying the precise timing and the successful release of natural enemies.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140054173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The brown planthopper, Nilaparvata lugens (Stål) (Hemiptera: Delphacidae) and the green rice leafhopper, Nephotettix cincticeps Uhler (Hemiptera: Cicadellidae) feed by sucking phloem sap from rice plants and excreting honeydew containing glucose. It is known that there are resistant rice cultivars against Ni. lugens or Ne. cincticeps, from which insects are unable to suck phloem sap. Here, we developed a simple method using a glucometer to measure glucose concentration in honeydew and use it to evaluate rice resistance against sucking insects. In case of Ni. lugens, the honeydew excreted by sucking a susceptible rice line was large in volume and glucose content. In contrast, the honeydew excreted by sucking a resistant rice line was low in volume and glucose content. In case of Ne. cincticeps, no glucose was detected in the honeydew excreted by sucking a resistant rice line, although more honeydew was excreted from the resistant rice line than the susceptible rice line. Therefore, it was suggested that Ne. cincticeps could not suck phloem sap of the resistant cultivar. Glucose analysis of honeydew using a glucometer would be useful for evaluating sucking inhibition of rice cultivars against Ni. lugens and Ne. cincticeps.
褐飞虱 Nilaparvata lugens (Stål) (Hemiptera: Delphacidae) 和绿稻叶蝉 Nephotettix cincticeps Uhler (Hemiptera: Cicadellidae) 通过吸食稻株的韧皮部汁液并排泄含有葡萄糖的蜜露为食。众所周知,有些水稻栽培品种对 Ni. lugens 或 Ne. cincticeps 具有抗性,昆虫无法从它们身上吸食韧皮部汁液。在此,我们开发了一种使用葡萄糖计测量蜜露中葡萄糖浓度的简单方法,并用它来评估水稻对吸吮昆虫的抗性。对于 Ni. lugens,吸食易感水稻品系排出的蜜露量大,葡萄糖含量高。相反,吸食抗性水稻品系排出的蜜露量少,葡萄糖含量低。就 Ne. cincticeps 而言,虽然抗性水稻品系比感病水稻品系排出更多蜜露,但吸吮抗性水稻品系排出的蜜露中未检测到葡萄糖。因此,这表明 Ne. cincticeps 无法吸食抗性栽培品种的韧皮部汁液。使用葡萄糖分析仪对蜜露进行葡萄糖分析,有助于评估水稻栽培品种对 Ni. lugens 和 Ne. cincticeps 的吸吮抑制作用。
{"title":"Evaluation of rice resistance against Nilaparvata lugens (Stål) (Hemiptera: Delphacidae) and Nephotettix cincticeps Uhler (Hemiptera: Cicadellidae) using glucometer analysis of honeydew","authors":"Tatsuhiko Yokozeki, Yukiko Matsumoto, Yoshinori Hatakeyama, Yasumori Tamura","doi":"10.1007/s13355-024-00865-w","DOIUrl":"https://doi.org/10.1007/s13355-024-00865-w","url":null,"abstract":"<p>The brown planthopper, <i>Nilaparvata lugens</i> (Stål) (Hemiptera: Delphacidae) and the green rice leafhopper, <i>Nephotettix cincticeps</i> Uhler (Hemiptera: Cicadellidae) feed by sucking phloem sap from rice plants and excreting honeydew containing glucose. It is known that there are resistant rice cultivars against <i>Ni. lugens</i> or <i>Ne. cincticeps</i>, from which insects are unable to suck phloem sap. Here, we developed a simple method using a glucometer to measure glucose concentration in honeydew and use it to evaluate rice resistance against sucking insects. In case of <i>Ni. lugens</i>, the honeydew excreted by sucking a susceptible rice line was large in volume and glucose content. In contrast, the honeydew excreted by sucking a resistant rice line was low in volume and glucose content. In case of <i>Ne. cincticeps</i>, no glucose was detected in the honeydew excreted by sucking a resistant rice line, although more honeydew was excreted from the resistant rice line than the susceptible rice line. Therefore, it was suggested that <i>Ne. cincticeps</i> could not suck phloem sap of the resistant cultivar. Glucose analysis of honeydew using a glucometer would be useful for evaluating sucking inhibition of rice cultivars against <i>Ni. lugens</i> and <i>Ne. cincticeps</i>.</p>","PeriodicalId":8551,"journal":{"name":"Applied Entomology and Zoology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}