K.L. Sutton, T. Kuhar, S.L. Rideout, S. Taylor, M.S. Reiter, A. D. Del Pozo-Valdivia, D. Reisig, K. McIntyre
Corn earworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), is a major insect pest of many agricultural crops in Virginia. Pyrethroids have been the major insecticide class used to control the pest for decades; however, H. zea resistance to pyrethroids has been widely documented in the southeastern and midwestern United States. To assess the pyrethroid susceptibility of H. zea in Virginia, we collected larval populations from the same five locations in 2021 and 2022 and used a quick end user–friendly bioassay to assess survival of larvae after feeding on insecticide-dipped edamame [Glycine max (L.) Merrill] pods. Pyrethroid efficacy varied between years and locations, with some 2021 H. zea populations showing reduced pyrethroid susceptibility, but not in 2022. This variability is most likely influenced by factors such as overwintering survivability in Virginia. Thus, the need for continued annual monitoring is important to track efficacy trends and grower recommendations. The simple bean-dip bioassay could be used as an efficient monitoring tool in the future, with pyrethroid susceptibility determined in 48 h from field collection.
玉米穗虫（Helicoverpa zea (Boddie)）（鳞翅目：夜蛾科）是弗吉尼亚州许多农作物的主要害虫。几十年来，拟除虫菊酯一直是用于控制该害虫的主要杀虫剂类别；然而，在美国东南部和中西部，玉米穗虫对拟除虫菊酯产生抗药性的情况已被广泛记录。为了评估弗吉尼亚州 H. zea 对拟除虫菊酯的敏感性，我们在 2021 年和 2022 年从相同的五个地点收集了幼虫种群，并使用了一种快速、方便用户使用的生物测定方法来评估幼虫取食蘸有杀虫剂的毛豆豆荚后的存活率。拟除虫菊酯的效力因年份和地点而异，2021 年的一些 H. zea 种群对拟除虫菊酯的敏感性降低，而 2022 年则没有。这种变化很可能受到弗吉尼亚州越冬存活率等因素的影响。因此，有必要继续进行年度监测，以跟踪药效趋势和种植者建议。简单的浸豆生物测定可用作未来的高效监测工具，从田间采集开始，48 小时内即可确定除虫菊酯的药敏性。
{"title":"Simple Insecticide Bean-Dip Bioassay Shows Pyrethroid Susceptibility of Helicoverpa zea (Lepidoptera: Noctuidae) Populations in Virginia Varies across Locations and Years1","authors":"K.L. Sutton, T. Kuhar, S.L. Rideout, S. Taylor, M.S. Reiter, A. D. Del Pozo-Valdivia, D. Reisig, K. McIntyre","doi":"10.18474/jes23-23","DOIUrl":"https://doi.org/10.18474/jes23-23","url":null,"abstract":"Corn earworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), is a major insect pest of many agricultural crops in Virginia. Pyrethroids have been the major insecticide class used to control the pest for decades; however, H. zea resistance to pyrethroids has been widely documented in the southeastern and midwestern United States. To assess the pyrethroid susceptibility of H. zea in Virginia, we collected larval populations from the same five locations in 2021 and 2022 and used a quick end user–friendly bioassay to assess survival of larvae after feeding on insecticide-dipped edamame [Glycine max (L.) Merrill] pods. Pyrethroid efficacy varied between years and locations, with some 2021 H. zea populations showing reduced pyrethroid susceptibility, but not in 2022. This variability is most likely influenced by factors such as overwintering survivability in Virginia. Thus, the need for continued annual monitoring is important to track efficacy trends and grower recommendations. The simple bean-dip bioassay could be used as an efficient monitoring tool in the future, with pyrethroid susceptibility determined in 48 h from field collection.","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":"58 7","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139256403","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}
Fejzo Bašić, Anis Hasanbegović, N. Šuta, Josip Jurković, E. Korjenić, Sanel Haseljić, S. Lelo
{"title":"Preliminary Data on Presence of Ophraella communa (Coleoptera: Chrysomelidae) in the Southeast of Bosnia and Herzegovina1","authors":"Fejzo Bašić, Anis Hasanbegović, N. Šuta, Josip Jurković, E. Korjenić, Sanel Haseljić, S. Lelo","doi":"10.18474/jes23-40","DOIUrl":"https://doi.org/10.18474/jes23-40","url":null,"abstract":"","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":"62 4","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139259404","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}
Menochilus sexmaculatusF. (Coleoptera: Coccinellidae) is a generalist predator with potential as a biological control candidate for suppressing many insect pests, including the cotton mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae). However, the potential control capacity of M. sexmaculatus on P. solenopsis may depend not only on its fitness and predatory efficacy, but also on the consequences of both conspecific and heterospecific interactions with other individuals that share the same resource. This study investigated the aggressiveness and vulnerability of different life stages of M. sexmaculatus when encountering various stages of M. sexmaculatus or Harmonia axyridis (Pallas). The results showed that M. sexmaculatus could act as predator and/or prey with the presence of conspecific and heterospecific ladybird beetles. The success of predation is affected by the ladybird beetle life stage and, in most cases, young stages of the ladybird beetles were most susceptible to relatively older life stages of ladybird beetles. Predation between M. sexmaculatus/H. axyridis larvae of the same developmental stage was always asymmetric, favoring H. axyridis. Moreover, M. sexmaculatus exhibited intensive aggressiveness toward their own species over heterospecific individuals, but was more vulnerable to H. axyridis than to M. sexmaculatus individuals. Overall, H. axyridis could negatively affect the population densities of M. sexmaculatus by its high aggressiveness and low vulnerability. However, because our study was conducted in an oversimplified and confined area, more research should be conducted under more realistic conditions to explore the impacts of H. axyridis on the population dynamics of M. sexmaculatus.
{"title":"Direct Effect of Cannibalism and Intraguild Predation in Menochilus sexmaculatus (Coleoptera: Coccinellidae)1","authors":"Xing-lin Yu, Yu-Tong Zhou, Yi Feng, Bao-Li Qiu","doi":"10.18474/jes23-08","DOIUrl":"https://doi.org/10.18474/jes23-08","url":null,"abstract":"Menochilus sexmaculatusF. (Coleoptera: Coccinellidae) is a generalist predator with potential as a biological control candidate for suppressing many insect pests, including the cotton mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae). However, the potential control capacity of M. sexmaculatus on P. solenopsis may depend not only on its fitness and predatory efficacy, but also on the consequences of both conspecific and heterospecific interactions with other individuals that share the same resource. This study investigated the aggressiveness and vulnerability of different life stages of M. sexmaculatus when encountering various stages of M. sexmaculatus or Harmonia axyridis (Pallas). The results showed that M. sexmaculatus could act as predator and/or prey with the presence of conspecific and heterospecific ladybird beetles. The success of predation is affected by the ladybird beetle life stage and, in most cases, young stages of the ladybird beetles were most susceptible to relatively older life stages of ladybird beetles. Predation between M. sexmaculatus/H. axyridis larvae of the same developmental stage was always asymmetric, favoring H. axyridis. Moreover, M. sexmaculatus exhibited intensive aggressiveness toward their own species over heterospecific individuals, but was more vulnerable to H. axyridis than to M. sexmaculatus individuals. Overall, H. axyridis could negatively affect the population densities of M. sexmaculatus by its high aggressiveness and low vulnerability. However, because our study was conducted in an oversimplified and confined area, more research should be conducted under more realistic conditions to explore the impacts of H. axyridis on the population dynamics of M. sexmaculatus.","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":"23 3","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139257240","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}
Barriers to gene flow can result in populations evolving into separate species, and understanding how these barriers evolve is a key step in understanding the process of speciation. This study investigates a major barrier to gene flow, mortality during development, of two parasitoid wasp species, Nasonia vitripennis Walker and N. giraulti Darling. Previous work has demonstrated high mortality in haploid hybrid males of these species and has shown potential rescue from this mortality in diploid hybrid females through backcrossing. However, this previous work did not directly measure egg clutch sizes in hybrids and also did not account for male eggs in these clutches. Here, we measure female-only egg and adult clutch sizes of both parent species and F2 hybrids, as well as F2 male egg and adult clutch sizes, in order to determine the impact of backcrossing on mortality in these hybrids. We find significant egg-to-adult mortality in diploid F2 hybrid females with a N. giraulti cytotype when backcrossed to N. vitripennis males; yet, these hybrids also experience less mortality than haploid F2 males. These results confirm the mortality and rescue in these F2 hybrid females and indicate that there is likely a combination of nuclear-cytoplasmic and nuclear-nuclear incompatibilities in these hybrids that lead to this mortality. This work provides a foundation for future studies to investigate the genetic basis of this mortality.
{"title":"Mortality in Interspecific Hybrids of Nasonia vitripennis and Nasonia giraulti (Hymenoptera: Pteromalidae)1","authors":"Bonnie A. Cobb, Joshua D. Gibson","doi":"10.18474/jes23-35","DOIUrl":"https://doi.org/10.18474/jes23-35","url":null,"abstract":"\u0000 Barriers to gene flow can result in populations evolving into separate species, and understanding how these barriers evolve is a key step in understanding the process of speciation. This study investigates a major barrier to gene flow, mortality during development, of two parasitoid wasp species, Nasonia vitripennis Walker and N. giraulti Darling. Previous work has demonstrated high mortality in haploid hybrid males of these species and has shown potential rescue from this mortality in diploid hybrid females through backcrossing. However, this previous work did not directly measure egg clutch sizes in hybrids and also did not account for male eggs in these clutches. Here, we measure female-only egg and adult clutch sizes of both parent species and F2 hybrids, as well as F2 male egg and adult clutch sizes, in order to determine the impact of backcrossing on mortality in these hybrids. We find significant egg-to-adult mortality in diploid F2 hybrid females with a N. giraulti cytotype when backcrossed to N. vitripennis males; yet, these hybrids also experience less mortality than haploid F2 males. These results confirm the mortality and rescue in these F2 hybrid females and indicate that there is likely a combination of nuclear-cytoplasmic and nuclear-nuclear incompatibilities in these hybrids that lead to this mortality. This work provides a foundation for future studies to investigate the genetic basis of this mortality.","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42857435","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}
Diego Treviño-Cueto, Eduardo Hidalgo Mayorga, Sergei Subbotin, Melchor Cepeda Siller, S. Sanchez-Peña
Entomopathogenic nematodes (EPNs) are important biological control agents of insect pests. Strains or isolates obtained in specific regions and utilized in situ might contribute to the success of EPNs, since they are adapted to local abiotic conditions. We isolated and identified three isolates each of Heterorhabditis bacteriophora Poinar and Steinernema carpocapsae (Weiser) from soils at Saltillo, Coahuila State, Mexico. These six isolates were bioassayed against larvae of Tenebrio molitor L., using six concentrations of infective juveniles (IJs) per larva (0, 10, 25, 50, 100, 200). EPN-induced mortality of the isolates ranged from 15.2% to 100%. The designated M5 isolate of S. carpocapsae caused 100% mortality after 72 h at concentrations ≥25 IJs/larva with a median lethal concentration of 4.99 IJs/larva. Comparison of mortality levels induced at the same concentration of the six EPN isolates indicated that the Steinernema isolates, in general, induced higher mortality levels than the Heterorhabditis isolates. IJ production in T. molitor larvae also was greatest with the M5 isolate of S. carpocapsae following exposure of larvae to a concentration of 100 IJs/larva with a mean of 17,320 IJs/larva. Based on induced mortality and IJ production, the S. carpocapsae M5 isolate appears to be a viable candidate for further study and possible development for use in insect pest management programs. This study indicates that naturally coexisting local nematode isolates possess different attributes critical for their use as biocontrol agents.
{"title":"Virulence and Reproduction of Entomopathogenic Nematodes Isolated from a Single Mexican Locality1","authors":"Diego Treviño-Cueto, Eduardo Hidalgo Mayorga, Sergei Subbotin, Melchor Cepeda Siller, S. Sanchez-Peña","doi":"10.18474/jes22-72","DOIUrl":"https://doi.org/10.18474/jes22-72","url":null,"abstract":"\u0000 Entomopathogenic nematodes (EPNs) are important biological control agents of insect pests. Strains or isolates obtained in specific regions and utilized in situ might contribute to the success of EPNs, since they are adapted to local abiotic conditions. We isolated and identified three isolates each of Heterorhabditis bacteriophora Poinar and Steinernema carpocapsae (Weiser) from soils at Saltillo, Coahuila State, Mexico. These six isolates were bioassayed against larvae of Tenebrio molitor L., using six concentrations of infective juveniles (IJs) per larva (0, 10, 25, 50, 100, 200). EPN-induced mortality of the isolates ranged from 15.2% to 100%. The designated M5 isolate of S. carpocapsae caused 100% mortality after 72 h at concentrations ≥25 IJs/larva with a median lethal concentration of 4.99 IJs/larva. Comparison of mortality levels induced at the same concentration of the six EPN isolates indicated that the Steinernema isolates, in general, induced higher mortality levels than the Heterorhabditis isolates. IJ production in T. molitor larvae also was greatest with the M5 isolate of S. carpocapsae following exposure of larvae to a concentration of 100 IJs/larva with a mean of 17,320 IJs/larva. Based on induced mortality and IJ production, the S. carpocapsae M5 isolate appears to be a viable candidate for further study and possible development for use in insect pest management programs. This study indicates that naturally coexisting local nematode isolates possess different attributes critical for their use as biocontrol agents.","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47289458","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}
Edgar D. Pérez Tesén, Jennifher E. Rodas Adrianzén, Alexander Chávez Cabrera, María E. Neira de Perales
Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is an economically important pest of variety of crops, including maize (Zea mays L.), rice (Oryza sativa L.), and cotton (Gossypium spp.). Conventional chemical insecticides are usually used for management of this pest; however, a viable alternative is the use of microbial agents or their biological products, such as entomopathogenic nematodes. Their efficacy, however, is affected by abiotic conditions including ultraviolet (UV) light and desiccation. It is therefore necessary to develop formulations that preserve or extend the viability of the agent or product while facilitating ease of application. This laboratory study was conducted to determine the pathogenicity of the nematode Heterorhabditis bacteriophora (Poinar) against S. frugiperda third-instar larvae. Infective juveniles (IJs) of the nematode were tested at a concentration of 350 IJs/ml in two substrates (water and 0.1% [w/v] agar suspension) with four periods of exposure (0, 5, 10 and 15 min) to UV radiation at 253.7 nm. Each of the eight treatments included 40 larvae, with each treatment replicated three times in a completely randomized design (two factors of type of medium and UV exposure time). We determined that the 0.1% (w/v) agar suspension, compared with the water substrate, protected the IJs from harmful UV light and thus improved the survival and pathogenicity of the IJs against third-instar S. frugiperda.
{"title":"Pathogenicity of Heterorhabditis bacteriophora in Ultraviolet Light–Irradiated Agar Suspension on Spodoptera frugiperda (Lepidoptera: Noctuidae) Larvae1","authors":"Edgar D. Pérez Tesén, Jennifher E. Rodas Adrianzén, Alexander Chávez Cabrera, María E. Neira de Perales","doi":"10.18474/jes22-48","DOIUrl":"https://doi.org/10.18474/jes22-48","url":null,"abstract":"\u0000 Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is an economically important pest of variety of crops, including maize (Zea mays L.), rice (Oryza sativa L.), and cotton (Gossypium spp.). Conventional chemical insecticides are usually used for management of this pest; however, a viable alternative is the use of microbial agents or their biological products, such as entomopathogenic nematodes. Their efficacy, however, is affected by abiotic conditions including ultraviolet (UV) light and desiccation. It is therefore necessary to develop formulations that preserve or extend the viability of the agent or product while facilitating ease of application. This laboratory study was conducted to determine the pathogenicity of the nematode Heterorhabditis bacteriophora (Poinar) against S. frugiperda third-instar larvae. Infective juveniles (IJs) of the nematode were tested at a concentration of 350 IJs/ml in two substrates (water and 0.1% [w/v] agar suspension) with four periods of exposure (0, 5, 10 and 15 min) to UV radiation at 253.7 nm. Each of the eight treatments included 40 larvae, with each treatment replicated three times in a completely randomized design (two factors of type of medium and UV exposure time). We determined that the 0.1% (w/v) agar suspension, compared with the water substrate, protected the IJs from harmful UV light and thus improved the survival and pathogenicity of the IJs against third-instar S. frugiperda.","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67939899","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}
Xiao-Jin Gao, Li Guo, Na Jiang, Yu Qi, Qin-Yao Jin, Shou-An Xie, Shu-Jie Iv
Odorant-binding proteins (OBPs) play an important role in specific recognition, binding, and transportation of odorants. In this study, the full-length complementary DNA (cDNA) sequence of AzanOBP7, a Minus-C OBP gene, from Agrilus zanthoxylumi Li Ming Lou (Coleoptera: Buprestidae) was cloned by rapid amplification of cDNA ends based on transcriptome data. The bioinformatic analysis showed that AzanOBP7 contains a 450-bp open reading frame encoding a 149-residue polypeptide, with a molecular mass of 17.176 kDa. It was predicted to be a nontransmembrane protein with an 18–amino acid signal peptide at the N terminus. The predicted three-dimensional structure of AzanOBP7 by AphadFold2 possesses seven α helices and two disulfide bridges. The multiple sequence alignment and phylogenetic tree revealed that AzanOBP7 reached the highest identity (94.70%) with Agrilus mali Matsumura (Coleoptera: Buprestidae) AmalOBP11; they also were closely aligned in a clade. Quantitative real-time polymerase chain reaction showed that AzanOBP7 exhibited the highest expression level in the abdomen of adult females. In the thorax, the expression level in adult males was significantly higher than that in other aged males (P < 0.01). Our study offers a theoretical foundation for further study on the functional characteristics of A. zanthoxylumi OBPs.
气味结合蛋白(OBPs)在气味的特异性识别、结合和运输中起着重要作用。本研究基于转录组数据，利用cDNA末端快速扩增的方法，克隆了花椒草(Agrilus zanthoxylumi Li Ming Lou) - c OBP基因AzanOBP7的全长互补DNA (cDNA)序列。生物信息学分析表明，AzanOBP7含有一个450-bp的开放阅读框，编码149个残基多肽，分子量为17.176 kDa。预测它是一个非跨膜蛋白，在N端有一个18个氨基酸的信号肽。AphadFold2预测AzanOBP7的三维结构具有7个α螺旋和2个二硫桥。多序列比对和系统进化树分析表明，AzanOBP7与松村Agrilus marsumura(鞘翅目:布氏目)AmalOBP11的同源性最高(94.70%);它们也紧密地排列在一个分支中。实时定量聚合酶链反应显示AzanOBP7在成年雌性腹部的表达量最高。在胸腔中，成年男性的表达量显著高于其他年龄男性(P < 0.01)。本研究为进一步研究花椒麻OBPs的功能特征提供了理论基础。
{"title":"Cloning and Expression Analysis of AzanOBP7, a Minus-C Odorant-Binding Protein Gene, from Agrilus zanthoxylumi (Coleoptera: Buprestidae)1","authors":"Xiao-Jin Gao, Li Guo, Na Jiang, Yu Qi, Qin-Yao Jin, Shou-An Xie, Shu-Jie Iv","doi":"10.18474/jes22-68","DOIUrl":"https://doi.org/10.18474/jes22-68","url":null,"abstract":"\u0000 Odorant-binding proteins (OBPs) play an important role in specific recognition, binding, and transportation of odorants. In this study, the full-length complementary DNA (cDNA) sequence of AzanOBP7, a Minus-C OBP gene, from Agrilus zanthoxylumi Li Ming Lou (Coleoptera: Buprestidae) was cloned by rapid amplification of cDNA ends based on transcriptome data. The bioinformatic analysis showed that AzanOBP7 contains a 450-bp open reading frame encoding a 149-residue polypeptide, with a molecular mass of 17.176 kDa. It was predicted to be a nontransmembrane protein with an 18–amino acid signal peptide at the N terminus. The predicted three-dimensional structure of AzanOBP7 by AphadFold2 possesses seven α helices and two disulfide bridges. The multiple sequence alignment and phylogenetic tree revealed that AzanOBP7 reached the highest identity (94.70%) with Agrilus mali Matsumura (Coleoptera: Buprestidae) AmalOBP11; they also were closely aligned in a clade. Quantitative real-time polymerase chain reaction showed that AzanOBP7 exhibited the highest expression level in the abdomen of adult females. In the thorax, the expression level in adult males was significantly higher than that in other aged males (P < 0.01). Our study offers a theoretical foundation for further study on the functional characteristics of A. zanthoxylumi OBPs.","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47397789","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}
Jermaine D. Perier, A. Lagalante, Elizabeth P. McCarty, Alvin M. Simmons, David G. Riley
Plant tissue bioassays are a standard approach for bioassaying insects such as the sweetpotato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), an insect that specializes in systemic feeding on the phloem in leaves by using a piercing-sucking mouthpart apparatus. Systemic insecticides remain the most effective approach to whitefly management; however, little work has been done to quantify the amount of insecticide active ingredient that a species is exposed to when feeding. This study was conducted to estimate the imidacloprid and cyantraniliprole concentrations present in cotton (Gossypium hirsutum L.) leaves 24 h after a root drench for systemic toxicological bioassays. Insecticide active-ingredient quantification involved liquid chromatography–tandem mass spectrometry. Comparable concentration responses also were conducted to indicate the mortality of the sweetpotato whitefly at the tested concentrations. The results indicated significant active-ingredient retention with higher concentrations of insecticide treatments, which corresponded with higher sweetpotato whitefly mortality. Specifically, for imidacloprid and cyantraniliprole, the average slopes and intercepts of the log parts per billion of leaf tissue concentration to milligrams of active ingredient per liter of treatment solution were y = 4.08 x + 0.83 and y = 6.22 x + 0.47, respectively. These formulae estimate leaf tissue concentrations that can be linked to insect insecticide exposure in the leaves, with 50–73% of the overall variability explained. Significant correlations also were observed between the root drench concentrations, leaf tissue concentrations, and sweetpotato whitefly mortality.
植物组织生物测定是生物测定昆虫的标准方法，如甘薯粉虱，烟粉虱(Gennadius)(半翅目:烟粉虱科)，一种专门利用刺穿-吸吮口器系统捕食叶子韧皮部的昆虫。系统杀虫剂仍然是管理粉虱最有效的方法;然而，对一个物种在进食时暴露于杀虫剂活性成分的量进行量化的工作很少。本研究测定了棉花根淋后24小时叶片中吡虫啉和氰虫腈的浓度，并进行了系统毒理学生物测定。杀虫剂有效成分的定量包括液相色谱-串联质谱法。还进行了比较浓度响应，以表明甘薯粉虱在测试浓度下的死亡率。结果表明，杀虫剂浓度越高，有效成分保留率越高，甘薯粉虱死亡率越高。具体而言，对于吡虫啉和氰虫腈，每升处理液中叶组织浓度对有效成分毫克数的对数的斜率和截距分别为y = 4.08 x + 0.83和y = 6.22 x + 0.47。这些公式估计叶片组织浓度可能与叶片中杀虫剂暴露有关，解释了总体变异的50-73%。根水浓度、叶组织浓度与甘薯粉虱死亡率之间也存在显著相关。
{"title":"Uptake and Retention of Imidacloprid and Cyantraniliprole in Cotton for the Control of Bemisia tabaci (Hemiptera: Aleyrodidae)1","authors":"Jermaine D. Perier, A. Lagalante, Elizabeth P. McCarty, Alvin M. Simmons, David G. Riley","doi":"10.18474/jes22-77","DOIUrl":"https://doi.org/10.18474/jes22-77","url":null,"abstract":"\u0000 Plant tissue bioassays are a standard approach for bioassaying insects such as the sweetpotato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), an insect that specializes in systemic feeding on the phloem in leaves by using a piercing-sucking mouthpart apparatus. Systemic insecticides remain the most effective approach to whitefly management; however, little work has been done to quantify the amount of insecticide active ingredient that a species is exposed to when feeding. This study was conducted to estimate the imidacloprid and cyantraniliprole concentrations present in cotton (Gossypium hirsutum L.) leaves 24 h after a root drench for systemic toxicological bioassays. Insecticide active-ingredient quantification involved liquid chromatography–tandem mass spectrometry. Comparable concentration responses also were conducted to indicate the mortality of the sweetpotato whitefly at the tested concentrations. The results indicated significant active-ingredient retention with higher concentrations of insecticide treatments, which corresponded with higher sweetpotato whitefly mortality. Specifically, for imidacloprid and cyantraniliprole, the average slopes and intercepts of the log parts per billion of leaf tissue concentration to milligrams of active ingredient per liter of treatment solution were y = 4.08 x + 0.83 and y = 6.22 x + 0.47, respectively. These formulae estimate leaf tissue concentrations that can be linked to insect insecticide exposure in the leaves, with 50–73% of the overall variability explained. Significant correlations also were observed between the root drench concentrations, leaf tissue concentrations, and sweetpotato whitefly mortality.","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44776400","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}
Daniel López-Lima, M. A. Tejeda-Reyes, Rafael Diego Rodríguez-Málaga, Everardo López-Bautista, A. Salinas-Castro, C. Illescas-Riquelme
Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) is an insect of Asian origin and is currently distributed in several countries around the world. It has highly polyphagous habits and has been reported as a primary pest of different fruit, horticultural, and ornamental crops. This species was reported in Mexico in 2020, however, due to its invasive nature and its rapid adaptation to new ecosystems, it is probably present in other regions of the country. The lack of information on this pest has resulted in misidentifications and misdiagnosis at the field level by phytosanitary technicians. In the present work, we found that S. dorsalis is distributed in the states of Veracruz, Sinaloa, Jalisco, and Michoacán in Mexico occupying sites with different climates (warm and temperate) and elevations from 6 to 1,721 m above sea level. Plant reproductive hosts were blackberry (Rubus sp.), blueberry (Vaccinium sp.), Persian lime (Citrus latifolia Tanaka), mango (Mangifera indica L.), and pear (Pyrus communis L.). Through an evaluation of the response of adults toward chromatic traps, we found that this species greatly prefers yellow (×5.40) compared with blue color. More studies are needed on detection and control measures in order to reduce the distribution and economic impact caused by this insect pest in Mexico.
{"title":"New Hosts, Distribution, and Color Trap Preferences of the Invasive Thrips Scirtothrips dorsalis (Thysanoptera: Thripidae) in Mexico1","authors":"Daniel López-Lima, M. A. Tejeda-Reyes, Rafael Diego Rodríguez-Málaga, Everardo López-Bautista, A. Salinas-Castro, C. Illescas-Riquelme","doi":"10.18474/jes23-11","DOIUrl":"https://doi.org/10.18474/jes23-11","url":null,"abstract":"\u0000 Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) is an insect of Asian origin and is currently distributed in several countries around the world. It has highly polyphagous habits and has been reported as a primary pest of different fruit, horticultural, and ornamental crops. This species was reported in Mexico in 2020, however, due to its invasive nature and its rapid adaptation to new ecosystems, it is probably present in other regions of the country. The lack of information on this pest has resulted in misidentifications and misdiagnosis at the field level by phytosanitary technicians. In the present work, we found that S. dorsalis is distributed in the states of Veracruz, Sinaloa, Jalisco, and Michoacán in Mexico occupying sites with different climates (warm and temperate) and elevations from 6 to 1,721 m above sea level. Plant reproductive hosts were blackberry (Rubus sp.), blueberry (Vaccinium sp.), Persian lime (Citrus latifolia Tanaka), mango (Mangifera indica L.), and pear (Pyrus communis L.). Through an evaluation of the response of adults toward chromatic traps, we found that this species greatly prefers yellow (×5.40) compared with blue color. More studies are needed on detection and control measures in order to reduce the distribution and economic impact caused by this insect pest in Mexico.","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44920985","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 contact toxicity activity of an essential oil extracted from Acorus calamus (L.) (Acoraceae) was evaluated against the phytophagous spider mites Tetranychus urticae Koch and Tetranychus macfarlanei Baker & Pritchard (Acari: Tetranychidae) and the predatory mite Amblyseius longispinosus (Evans) (Acari: Phytoseiidae). Adult mortality 24 h following application of 5% (v/v) concentration of the essential oil exceeded 90% for T. urticae and T. macfarlanei. Application of 1.2–5% concentrations of the essential oil to mite eggs reduced egg viability, with 0–54% hatch of T. urticae eggs and 0% hatch of T. macfarlanei eggs 6 d following treatment. At 2.5%, the essential oil was toxic to A. longipinosus by residual contact toxicity (58% mortality) and direct contact toxicity (0% mortality). No eggs and 47.6 eggs of A. longispinosus were oviposited with residual contact toxicity and direct contact toxicity, respectively. The chemical constituents of the essential oil, as determined with gas chromatography–mass spectrometry, showed that camphor (41.07%) and 5,5-dimethyl-2-ethynylcyclopent-2-en-1-ol (27.96%) were the major chemical compounds of the essential oil. These results indicate that this essential oil extracted from fresh A. calamus rhizomes could prove useful in controlling T. urticae and T. macfarlanei. Our findings also showed that the essential oil had no deleterious effects against A. longispinosus by direct contact toxicity test; however, A. longispinosus consuming spider mite eggs treated with essential oil were negatively impacted.
{"title":"Contact Toxicity of an Essential Oil from Acorus calamus (Acoraceae) Rhizomes against Tetranychus urticae and Tetranychus macfarlanei (Acari: Tetranychidae) and Amblyseius longispinosus (Acari: Phytoseiidae)1","authors":"W. Auamcharoen, K. Janlaor","doi":"10.18474/jes22-66","DOIUrl":"https://doi.org/10.18474/jes22-66","url":null,"abstract":"\u0000 The contact toxicity activity of an essential oil extracted from Acorus calamus (L.) (Acoraceae) was evaluated against the phytophagous spider mites Tetranychus urticae Koch and Tetranychus macfarlanei Baker & Pritchard (Acari: Tetranychidae) and the predatory mite Amblyseius longispinosus (Evans) (Acari: Phytoseiidae). Adult mortality 24 h following application of 5% (v/v) concentration of the essential oil exceeded 90% for T. urticae and T. macfarlanei. Application of 1.2–5% concentrations of the essential oil to mite eggs reduced egg viability, with 0–54% hatch of T. urticae eggs and 0% hatch of T. macfarlanei eggs 6 d following treatment. At 2.5%, the essential oil was toxic to A. longipinosus by residual contact toxicity (58% mortality) and direct contact toxicity (0% mortality). No eggs and 47.6 eggs of A. longispinosus were oviposited with residual contact toxicity and direct contact toxicity, respectively. The chemical constituents of the essential oil, as determined with gas chromatography–mass spectrometry, showed that camphor (41.07%) and 5,5-dimethyl-2-ethynylcyclopent-2-en-1-ol (27.96%) were the major chemical compounds of the essential oil. These results indicate that this essential oil extracted from fresh A. calamus rhizomes could prove useful in controlling T. urticae and T. macfarlanei. Our findings also showed that the essential oil had no deleterious effects against A. longispinosus by direct contact toxicity test; however, A. longispinosus consuming spider mite eggs treated with essential oil were negatively impacted.","PeriodicalId":15765,"journal":{"name":"Journal of Entomological Science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49013620","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：