Abstract We characterized the entomopathogenic fungal species, Conoideocrella luteorostrata (Zimm.) D. Johnson, G.H. Sung, Hywel-Jones & Spatafora (Hypocreales: Clavicipitaceae), on the elongate hemlock scale, Fiorinia externa Ferris (Hemiptera: Diaspididae), infesting Fraser fir Christmas tree, Abies fraseri (Pursh) Poir (Pinaceae). Fraser fir Christmas trees that were cultivated in Michigan, North Carolina, and Virginia were intercepted in Florida during plant inspection. This study is based on the isolation in pure culture, and morphological and molecular characterization using a 4-locus (ITS, LSU, SSU, tef1) and represents the first record of C. luteorostrata on F. externa. In addition, we reviewed all previously reported natural enemies of F. externa in the USA, discussed their potential as biological control agents, and concluded the need to explore a new natural enemy of F. externa. We recommend using C. luteorostrata as a biocontrol agent for F. externa. We also suggest that our isolate could be a source of new uncharacterized active compounds and could be used in the biological control of whiteflies and scale insects, as demonstrated in other C. luteorostrata strains. We also discussed the importance of investigating biological control agents in pest and pathogen interception samples.
{"title":"Characterization of the Entomopathogenic Fungal Species Conoideocrella luteorostrata on the Scale Insect Pest Fiorinia externa Infesting the Christmas Tree Abies fraseri in the USA","authors":"Hector Urbina, M. Ahmed","doi":"10.1653/024.105.0103","DOIUrl":"https://doi.org/10.1653/024.105.0103","url":null,"abstract":"Abstract We characterized the entomopathogenic fungal species, Conoideocrella luteorostrata (Zimm.) D. Johnson, G.H. Sung, Hywel-Jones & Spatafora (Hypocreales: Clavicipitaceae), on the elongate hemlock scale, Fiorinia externa Ferris (Hemiptera: Diaspididae), infesting Fraser fir Christmas tree, Abies fraseri (Pursh) Poir (Pinaceae). Fraser fir Christmas trees that were cultivated in Michigan, North Carolina, and Virginia were intercepted in Florida during plant inspection. This study is based on the isolation in pure culture, and morphological and molecular characterization using a 4-locus (ITS, LSU, SSU, tef1) and represents the first record of C. luteorostrata on F. externa. In addition, we reviewed all previously reported natural enemies of F. externa in the USA, discussed their potential as biological control agents, and concluded the need to explore a new natural enemy of F. externa. We recommend using C. luteorostrata as a biocontrol agent for F. externa. We also suggest that our isolate could be a source of new uncharacterized active compounds and could be used in the biological control of whiteflies and scale insects, as demonstrated in other C. luteorostrata strains. We also discussed the importance of investigating biological control agents in pest and pathogen interception samples.","PeriodicalId":12297,"journal":{"name":"Florida Entomologist","volume":"105 1","pages":"10 - 21"},"PeriodicalIF":1.4,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42707040","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}
Abstract Stink bugs (Hemiptera: Pentatomidae) are polyphagous pests that disperse from woodland habitats into crops following food availability. Black cherry (Prunus serotina Ehrh.; Rosaceae) is common in the southeast US. In this 3-yr study, our principal objective was to determine if black cherry acts as a reproductive host as well as a source of food for stink bugs in woodland habitats adjacent to crops in Georgia, USA. Each yr, black cherry trees were examined visually for stink bug species and stages in addition to using pheromone-baited canopy and ground traps to capture them. In 2016, we compared the number of stink bugs captured in canopy traps versus ground-based traps. Chinavia hilaris Say, Euschistus servus (Say), Euschistus tristigmus (Say), and Nezara viridula (L.) (all Hemiptera: Pentatomidae) were detected in traps each yr of the study. Total number of stink bugs was significantly higher in ground traps (1.53 ± 0.07) compared to canopy traps (0.71 ± 0.07) in the 2016 test. Only C. hilaris (99.2%) and N. viridula (0.8%) were found on trees during visual sampling. Over both types of sampling methods, egg masses, most instars, and both sexes of adults of C. hilaris were detected in black cherry. The nymph to adult ratio for this species was 1:1 in traps and nymph biased in visual samples. Anastatus reduvii (Howard) (Hymenoptera: Eupelmidae) (44%), Trissolcus edessae Fouts (Hymenoptera: Scelionidae) (35%), and Ooencyrtus sp. (Hymenoptera: Encyrtidae) (21%) emerged from C. hilaris egg masses. The nymph to adult ratio for N. viridula was adult biased. Both nymphs and adults of E. servus and E. tristigmus were captured in traps; however, the majority of individuals were adults. We conclude that black cherry is a significant reproductive host and a food source for C. hilaris. However, our results indicate that it serves as a food source more so than a reproductive host for the other 3 stink bug species.
{"title":"Black Cherry as A Host Plant For Stink Bugs (Hemiptera: Pentatomidae) in Agroecosystems in Georgia, USA","authors":"P. G. Tillman, T. Cottrell, E. Grabarczyk","doi":"10.1653/024.105.0112","DOIUrl":"https://doi.org/10.1653/024.105.0112","url":null,"abstract":"Abstract Stink bugs (Hemiptera: Pentatomidae) are polyphagous pests that disperse from woodland habitats into crops following food availability. Black cherry (Prunus serotina Ehrh.; Rosaceae) is common in the southeast US. In this 3-yr study, our principal objective was to determine if black cherry acts as a reproductive host as well as a source of food for stink bugs in woodland habitats adjacent to crops in Georgia, USA. Each yr, black cherry trees were examined visually for stink bug species and stages in addition to using pheromone-baited canopy and ground traps to capture them. In 2016, we compared the number of stink bugs captured in canopy traps versus ground-based traps. Chinavia hilaris Say, Euschistus servus (Say), Euschistus tristigmus (Say), and Nezara viridula (L.) (all Hemiptera: Pentatomidae) were detected in traps each yr of the study. Total number of stink bugs was significantly higher in ground traps (1.53 ± 0.07) compared to canopy traps (0.71 ± 0.07) in the 2016 test. Only C. hilaris (99.2%) and N. viridula (0.8%) were found on trees during visual sampling. Over both types of sampling methods, egg masses, most instars, and both sexes of adults of C. hilaris were detected in black cherry. The nymph to adult ratio for this species was 1:1 in traps and nymph biased in visual samples. Anastatus reduvii (Howard) (Hymenoptera: Eupelmidae) (44%), Trissolcus edessae Fouts (Hymenoptera: Scelionidae) (35%), and Ooencyrtus sp. (Hymenoptera: Encyrtidae) (21%) emerged from C. hilaris egg masses. The nymph to adult ratio for N. viridula was adult biased. Both nymphs and adults of E. servus and E. tristigmus were captured in traps; however, the majority of individuals were adults. We conclude that black cherry is a significant reproductive host and a food source for C. hilaris. However, our results indicate that it serves as a food source more so than a reproductive host for the other 3 stink bug species.","PeriodicalId":12297,"journal":{"name":"Florida Entomologist","volume":"105 1","pages":"79 - 86"},"PeriodicalIF":1.4,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42768860","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}
Summary Two main pests were found attacking purple mombin or Spanish plum, Spondias purpurea (Sapindales: Anacardiaceae) in Homestead, Florida, USA: Tenuipalpus uvae De Leon (Acari: Tenuipalpidae), a flat mite damaging the leaves, and the spondias psyllid, Calophya spondiadis Burkhardt & Mendez (Hemiptera: Psyllidae) feeding on the flowers, fruitlets, and tender expanding leaves. Tenuipalpus uvae populations are composed principally of females. Female longevity was 13.1 ± 2.0 d and unmated females oviposited 5.0 ± 1.0 eggs in their lifetime. On average, eclosure time for eggs from laboratory-reared unmated females was 10.2 ± 0.1 d, and developmental times for the larva, protonymph, and deutonymph were 6.6 ± 0.4 d, 5.7 ± 0.2 d, and 6.8 ± 0.7 d, respectively. In a survey of S. purpurea leaflets, the upper surface had a significantly higher number of nymph and adult mites (6.43 ± 0.60) than the lower surface (2.29 ± 0.35). Calophya spondiadis laid their eggs on flowers at first, because these were the first to sprout in Jan, and they were heavily infested by the end of Mar with an average of 10.9 ± 1.5 eggs and 9.6 ± 1.1 nymphs per flower. Few eggs or nymphs (0.17 ± 0.17 and 0.08 ± 0.08, respectively) were found per fruit; nonetheless, the fruit did have multiple punctures or necrotic spots (16.7 ± 4.3 per fruit), likely acquired as nymphs fed on the flowers and their ovaries. Significantly more eggs were found on the upper surface of the leaves and the petiole portion adjacent to each leaflet than the underside of the leaves, and most nymphs migrated to the undersides. The feeding damage resulted in black, necrotic spots that became brown pits as the leaves matured and hardened.
{"title":"Tenuipalpus uvae (Acari: Tenuipalpidae) and Calophya spondiadis (Hemiptera: Psyllidae), pests of Spondias in Florida, USA","authors":"R. Duncan, J. Peña, D. Carrillo","doi":"10.1653/024.105.0113","DOIUrl":"https://doi.org/10.1653/024.105.0113","url":null,"abstract":"Summary Two main pests were found attacking purple mombin or Spanish plum, Spondias purpurea (Sapindales: Anacardiaceae) in Homestead, Florida, USA: Tenuipalpus uvae De Leon (Acari: Tenuipalpidae), a flat mite damaging the leaves, and the spondias psyllid, Calophya spondiadis Burkhardt & Mendez (Hemiptera: Psyllidae) feeding on the flowers, fruitlets, and tender expanding leaves. Tenuipalpus uvae populations are composed principally of females. Female longevity was 13.1 ± 2.0 d and unmated females oviposited 5.0 ± 1.0 eggs in their lifetime. On average, eclosure time for eggs from laboratory-reared unmated females was 10.2 ± 0.1 d, and developmental times for the larva, protonymph, and deutonymph were 6.6 ± 0.4 d, 5.7 ± 0.2 d, and 6.8 ± 0.7 d, respectively. In a survey of S. purpurea leaflets, the upper surface had a significantly higher number of nymph and adult mites (6.43 ± 0.60) than the lower surface (2.29 ± 0.35). Calophya spondiadis laid their eggs on flowers at first, because these were the first to sprout in Jan, and they were heavily infested by the end of Mar with an average of 10.9 ± 1.5 eggs and 9.6 ± 1.1 nymphs per flower. Few eggs or nymphs (0.17 ± 0.17 and 0.08 ± 0.08, respectively) were found per fruit; nonetheless, the fruit did have multiple punctures or necrotic spots (16.7 ± 4.3 per fruit), likely acquired as nymphs fed on the flowers and their ovaries. Significantly more eggs were found on the upper surface of the leaves and the petiole portion adjacent to each leaflet than the underside of the leaves, and most nymphs migrated to the undersides. The feeding damage resulted in black, necrotic spots that became brown pits as the leaves matured and hardened.","PeriodicalId":12297,"journal":{"name":"Florida Entomologist","volume":"105 1","pages":"87 - 90"},"PeriodicalIF":1.4,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42150665","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}
M. Ascunce, R. V. Vander Meer, Satya Chinta, Cassandra S. Ogura-Yamada, D. Oishi
Summary Ants intercepted by the Hawaii Department of Agriculture in 2018 and 2019 identified as Solenopsis spp., and possibly S. invicta, were submitted to the United States Department of Agriculture-Agricultural Research Service-Center for Medical, Agricultural and Veterinary Entomology, Imported Fire Ant and Household Insects Research Unit for further taxonomic assessment using genetic and chemical methods. The 2018 sample consisted of 1 worker ant, and the 2019 sample consisted of 3 worker ants. Thoraces were used for genetic assessment and gasters were used for venom analyses. It was determined readily from genetic and chemical analyses that the intercepted ants were not S. invicta or S. richteri. Mitochondrial COX1 gene sequences were compared with previously published data from Solenopsis species. The closest match for the 2018 sample was S. xyloni, which is native to the shipment's origin (San Diego, California, USA). The 2 major alkaloids found were characteristic of the S. geminata species group. In addition, the alkaloid ratio closely matched that of S. xyloni. Therefore, the alkaloid analysis of the 2018 intercepted ant concurs with the genetic data that the ant was an S. xyloni worker. The COX1 gene sequences of the 2019 interceptions most closely matched S. geminata. The corresponding venom alkaloid profile also eliminated S. invicta and S. richteri as possibilities. However, 1 major alkaloid was unusual (Fig. 2) and normally is found only in trace amounts. We suggest the 2019 specimens are an unusual variant of S. geminata.
{"title":"Genetic and Chemical Profiling of Solenopsis spp. (Hymenoptera: Formicidae) Intercepted in Hawaii","authors":"M. Ascunce, R. V. Vander Meer, Satya Chinta, Cassandra S. Ogura-Yamada, D. Oishi","doi":"10.1653/024.105.0114","DOIUrl":"https://doi.org/10.1653/024.105.0114","url":null,"abstract":"Summary Ants intercepted by the Hawaii Department of Agriculture in 2018 and 2019 identified as Solenopsis spp., and possibly S. invicta, were submitted to the United States Department of Agriculture-Agricultural Research Service-Center for Medical, Agricultural and Veterinary Entomology, Imported Fire Ant and Household Insects Research Unit for further taxonomic assessment using genetic and chemical methods. The 2018 sample consisted of 1 worker ant, and the 2019 sample consisted of 3 worker ants. Thoraces were used for genetic assessment and gasters were used for venom analyses. It was determined readily from genetic and chemical analyses that the intercepted ants were not S. invicta or S. richteri. Mitochondrial COX1 gene sequences were compared with previously published data from Solenopsis species. The closest match for the 2018 sample was S. xyloni, which is native to the shipment's origin (San Diego, California, USA). The 2 major alkaloids found were characteristic of the S. geminata species group. In addition, the alkaloid ratio closely matched that of S. xyloni. Therefore, the alkaloid analysis of the 2018 intercepted ant concurs with the genetic data that the ant was an S. xyloni worker. The COX1 gene sequences of the 2019 interceptions most closely matched S. geminata. The corresponding venom alkaloid profile also eliminated S. invicta and S. richteri as possibilities. However, 1 major alkaloid was unusual (Fig. 2) and normally is found only in trace amounts. We suggest the 2019 specimens are an unusual variant of S. geminata.","PeriodicalId":12297,"journal":{"name":"Florida Entomologist","volume":"105 1","pages":"91 - 94"},"PeriodicalIF":1.4,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42182805","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}
Abstract The red imported fire ant, Solenopsis invicta (Buren) (Hymenoptera: Formicidae), is one of the most prolific invasive species in the southeastern US. These invaders preferentially colonize highly disturbed land and grassland habitat. Management of livestock in pasture systems can have a profound impact on the level of disturbance in grassland habitats, and we hypothesized that adaptive multi-paddock pasture management would significantly increase S. invicta abundance in southeastern US pastures where arthropod diversity would decrease as S. invicta abundance increases. We studied the effects that adaptive multi-paddock pasture management systems (based on stocking density, rotation frequency, and insecticide/anthelmintic [wormer] application rates) have on fire ant mound abundance and arthropod diversity for the soil, foliar, and dung communities. Solenopsis invicta mounds and mound areas were documented along transect lines in 6 pastures. Soil and foliar arthropod communities were collected along the same transect lines, and dung communities were sampled from pats within the pasture system. Pastures managed under adaptive multi-paddock practices had 3.4× more S. invicta mounds and 4.6× more mound area than their conventionally managed counterparts. However, arthropod diversity did not correlate with S. invicta abundance in any of the 3 arthropod communities sampled. This study shows adaptive multi-paddock pasture management can increase S. invicta mound abundance, but arthropod communities in adaptive multi-paddock pastures do not suffer decreased diversity from increased abundance of S. invicta.
{"title":"Red Imported Fire Ant, Solenopsis invicta (Burden) (Hymenoptera: Formicidae), Abundance and Arthropod Community Diversity Affected by Pasture Management","authors":"Ryan B. Schmid, J. Lundgren","doi":"10.1653/024.105.0108","DOIUrl":"https://doi.org/10.1653/024.105.0108","url":null,"abstract":"Abstract The red imported fire ant, Solenopsis invicta (Buren) (Hymenoptera: Formicidae), is one of the most prolific invasive species in the southeastern US. These invaders preferentially colonize highly disturbed land and grassland habitat. Management of livestock in pasture systems can have a profound impact on the level of disturbance in grassland habitats, and we hypothesized that adaptive multi-paddock pasture management would significantly increase S. invicta abundance in southeastern US pastures where arthropod diversity would decrease as S. invicta abundance increases. We studied the effects that adaptive multi-paddock pasture management systems (based on stocking density, rotation frequency, and insecticide/anthelmintic [wormer] application rates) have on fire ant mound abundance and arthropod diversity for the soil, foliar, and dung communities. Solenopsis invicta mounds and mound areas were documented along transect lines in 6 pastures. Soil and foliar arthropod communities were collected along the same transect lines, and dung communities were sampled from pats within the pasture system. Pastures managed under adaptive multi-paddock practices had 3.4× more S. invicta mounds and 4.6× more mound area than their conventionally managed counterparts. However, arthropod diversity did not correlate with S. invicta abundance in any of the 3 arthropod communities sampled. This study shows adaptive multi-paddock pasture management can increase S. invicta mound abundance, but arthropod communities in adaptive multi-paddock pastures do not suffer decreased diversity from increased abundance of S. invicta.","PeriodicalId":12297,"journal":{"name":"Florida Entomologist","volume":"105 1","pages":"53 - 57"},"PeriodicalIF":1.4,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48587856","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}
G. Tepa-Yotto, R. Meagher, Jeannette K. Winsou, Borghéro T. A. Dahoueto, M. Tamò, M. Sæthre, R. Nagoshi
Abstract The fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), has now become a pest of global concern. Originally known to be endemic to the Western Hemisphere, its first detection in Africa was followed by spectacular outbreaks and spread to almost all sub-Saharan countries. The rapid incursion of S. frugiperda on maize (Zea mays L.; Poaceae) fields in Africa highlighted a crucial need for a comprehensive assessment of integrated pest management strategies in most smallholder farms. However, these strategies cannot successfully function without efficient monitoring and surveillance efforts. These trapping studies were designed to provide an indication as to whether pheromone trap-lure combinations and simple changes in landscape and agricultural practices might mitigate fall armyworm infestations. Our data show that the commercially available Unitrap was the most effective design for fall armyworm captures among the traps tested. The inexpensive home-made 2 L jar trap was capable of consistently collecting fall armyworm during the first season of relatively moderate fall armyworm density. However, the number of fall armyworm captured by home-made trap were several fold lower than by the Unitrap under all conditions, and almost no fall armyworm was captured during the second season by home-made 2 L jar when fall armyworm density was low. Substantial differences were observed among the pheromone blends with respect to numbers of fall armyworm and non-targets captured. The 4-component blend attracted the most fall armyworm under all conditions. The 2-component blend was the most selective, with no non-target species found during the second season experiments.
{"title":"Monitoring Spodoptera frugiperda in Benin: assessing the influence of trap type, pheromone blends, and habitat on pheromone trapping","authors":"G. Tepa-Yotto, R. Meagher, Jeannette K. Winsou, Borghéro T. A. Dahoueto, M. Tamò, M. Sæthre, R. Nagoshi","doi":"10.1653/024.105.0111","DOIUrl":"https://doi.org/10.1653/024.105.0111","url":null,"abstract":"Abstract The fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), has now become a pest of global concern. Originally known to be endemic to the Western Hemisphere, its first detection in Africa was followed by spectacular outbreaks and spread to almost all sub-Saharan countries. The rapid incursion of S. frugiperda on maize (Zea mays L.; Poaceae) fields in Africa highlighted a crucial need for a comprehensive assessment of integrated pest management strategies in most smallholder farms. However, these strategies cannot successfully function without efficient monitoring and surveillance efforts. These trapping studies were designed to provide an indication as to whether pheromone trap-lure combinations and simple changes in landscape and agricultural practices might mitigate fall armyworm infestations. Our data show that the commercially available Unitrap was the most effective design for fall armyworm captures among the traps tested. The inexpensive home-made 2 L jar trap was capable of consistently collecting fall armyworm during the first season of relatively moderate fall armyworm density. However, the number of fall armyworm captured by home-made trap were several fold lower than by the Unitrap under all conditions, and almost no fall armyworm was captured during the second season by home-made 2 L jar when fall armyworm density was low. Substantial differences were observed among the pheromone blends with respect to numbers of fall armyworm and non-targets captured. The 4-component blend attracted the most fall armyworm under all conditions. The 2-component blend was the most selective, with no non-target species found during the second season experiments.","PeriodicalId":12297,"journal":{"name":"Florida Entomologist","volume":"105 1","pages":"71 - 78"},"PeriodicalIF":1.4,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46117198","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}
Alejandro H. Pabón-Valverde, J. Michaud, G. Vargas
Abstract The giant sugarcane borer, Telchin licus (Drury) (Lepidoptera: Castniidae), also known as the banana stem borer, is an economically important pest of sugarcane in eastern Colombia. The presence of larval and pupal stages within stalks makes biological control of this pest difficult, and growers often resort to insecticide applications. Hilling up the soil around the base of plants, or soil mounding, is a cultural practice sometimes used to improve rooting in sugarcane. Because mature larvae cut holes in stalks close to ground level through which they can emerge as an adult, we hypothesized that soil mounding would impede adult emergence, and thus contribute to population reduction. Two experiments were conducted in fields with significant infestations of this pest in Puerto López, Meta, Colombia, during the seasons of adult emergence in this region (Apr–May and Oct–Nov). Manual mounding of soil to a height of 20 cm was tested in the first trial, and mechanized mounding of soil in the second, which also compared 2 mounding heights (10 and 20 cm). In both cases, 2 m row transects of plants were caged to collect emergent adults. Adult emergence was reduced up to 65% in all mounding treatments, whether manual or mechanical, and regardless of mounding height, demonstrating that this cultural practice could be a useful tactic for inclusion in an integrated management program for this pest. However, as with any other cultural practice in pest management, region-wide implementation likely would be required to impact local population densities, and efficacy will depend further on low levels of moth immigration from alternative host plants.
{"title":"Cultural Control of Giant Sugarcane Borer, Telchin licus (Lepidoptera: Castniidae), by Soil Mounding to Impede Adult Emergence","authors":"Alejandro H. Pabón-Valverde, J. Michaud, G. Vargas","doi":"10.1653/024.105.0104","DOIUrl":"https://doi.org/10.1653/024.105.0104","url":null,"abstract":"Abstract The giant sugarcane borer, Telchin licus (Drury) (Lepidoptera: Castniidae), also known as the banana stem borer, is an economically important pest of sugarcane in eastern Colombia. The presence of larval and pupal stages within stalks makes biological control of this pest difficult, and growers often resort to insecticide applications. Hilling up the soil around the base of plants, or soil mounding, is a cultural practice sometimes used to improve rooting in sugarcane. Because mature larvae cut holes in stalks close to ground level through which they can emerge as an adult, we hypothesized that soil mounding would impede adult emergence, and thus contribute to population reduction. Two experiments were conducted in fields with significant infestations of this pest in Puerto López, Meta, Colombia, during the seasons of adult emergence in this region (Apr–May and Oct–Nov). Manual mounding of soil to a height of 20 cm was tested in the first trial, and mechanized mounding of soil in the second, which also compared 2 mounding heights (10 and 20 cm). In both cases, 2 m row transects of plants were caged to collect emergent adults. Adult emergence was reduced up to 65% in all mounding treatments, whether manual or mechanical, and regardless of mounding height, demonstrating that this cultural practice could be a useful tactic for inclusion in an integrated management program for this pest. However, as with any other cultural practice in pest management, region-wide implementation likely would be required to impact local population densities, and efficacy will depend further on low levels of moth immigration from alternative host plants.","PeriodicalId":12297,"journal":{"name":"Florida Entomologist","volume":"105 1","pages":"22 - 26"},"PeriodicalIF":1.4,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48698900","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}
Amin N. Al Ansi, Y. Aldryhim, Abdulrahman A. Al Janobi, A. Aldawood
Abstract Pheromone traps play a crucial role in the integrated pest management of the red palm weevil, Rhynchophorus ferrugineus (Olivier) (Coleoptera: Curculionidae). The objective of this study was to increase the effectiveness of pheromone traps by evaluating the effects of location, temperature, degree of palm fruit fermentation, and pheromone lure source on red palm weevil capture rates. Traps baited with either Ferrolure or Rhylure were positioned in 3 rows and checked twice per wk for 12 wk starting 20 Apr 2019. Overall weekly capture rate per trap varied from 1.25 to 9.00. Those traps that were placed in the shade near infested date palm trees in areas of relatively high soil moisture captured more red palm weevil (9 adults per trap per wk) than traps exposed to direct sunlight (1.25 adults per trap per wk). Additionally, traps placed at the field edge captured more adults than those in the middle of the field. Capture rates were highly negatively correlated with temperature. Ferrolure traps captured significantly more red palm weevils than Rhylure traps. The sex ratio of captured weevils in all traps was female-biased. Results obtained from Y-tube olfactometer assays indicated that the response of red palm weevil adults to 5- and 8 d old fermented date fruits were relatively high (86.7–100%). In kairomone field tests more red palm weevil adults were attracted to traps with 8 d fermented date fruits compared with 5 d old. Our results indicated that placing traps containing Ferrolure, water, and kairomones in red palm weevil preferred sites near the edges of the orchard in moderate air temperatures (22–33 °C) increased the efficacy of pheromone traps.
{"title":"Effects of Trap Locations, Pheromone Source, and Temperature on Red Palm Weevil Surveillance (Coleoptera: Dryophthoridae)","authors":"Amin N. Al Ansi, Y. Aldryhim, Abdulrahman A. Al Janobi, A. Aldawood","doi":"10.1653/024.105.0109","DOIUrl":"https://doi.org/10.1653/024.105.0109","url":null,"abstract":"Abstract Pheromone traps play a crucial role in the integrated pest management of the red palm weevil, Rhynchophorus ferrugineus (Olivier) (Coleoptera: Curculionidae). The objective of this study was to increase the effectiveness of pheromone traps by evaluating the effects of location, temperature, degree of palm fruit fermentation, and pheromone lure source on red palm weevil capture rates. Traps baited with either Ferrolure or Rhylure were positioned in 3 rows and checked twice per wk for 12 wk starting 20 Apr 2019. Overall weekly capture rate per trap varied from 1.25 to 9.00. Those traps that were placed in the shade near infested date palm trees in areas of relatively high soil moisture captured more red palm weevil (9 adults per trap per wk) than traps exposed to direct sunlight (1.25 adults per trap per wk). Additionally, traps placed at the field edge captured more adults than those in the middle of the field. Capture rates were highly negatively correlated with temperature. Ferrolure traps captured significantly more red palm weevils than Rhylure traps. The sex ratio of captured weevils in all traps was female-biased. Results obtained from Y-tube olfactometer assays indicated that the response of red palm weevil adults to 5- and 8 d old fermented date fruits were relatively high (86.7–100%). In kairomone field tests more red palm weevil adults were attracted to traps with 8 d fermented date fruits compared with 5 d old. Our results indicated that placing traps containing Ferrolure, water, and kairomones in red palm weevil preferred sites near the edges of the orchard in moderate air temperatures (22–33 °C) increased the efficacy of pheromone traps.","PeriodicalId":12297,"journal":{"name":"Florida Entomologist","volume":"105 1","pages":"58 - 64"},"PeriodicalIF":1.4,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47714688","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}
A. Revynthi, L. F. Cruz, Maria A. Canon, J. Crane, P. Kendra, C. Mannion, D. Carrillo
Abstract The lychee erinose mite, Aceria litchii (Keifer) (Acari: Eriophyidae), is an important pest of lychee (Litchi chinensis Sonn.; Sapindaceae) trees. This minute mite prefers to feed on young, new flush causing the formation of galls called “erinea.” Chemical control to protect the new flush is the primary management approach that has been used to control this mite. Aceria litchii was detected recently in Lee County, Florida, USA, and there is an urgent need to identify an acaricide that can control mite populations. Among the acaricides registered for use on lychee in Florida, abamectin was reported to be effective against A. litchii from other parts of the world. However, it remains unknown whether this acaricide can control the mites inside the erinea effectively and protect the new flush. We investigated whether abamectin alone or in combination with an organosilicone surfactant could control an existing mite infestation. Lychee leaflets that had erinea were sprayed with acaricides, then placed on uninfested plants and monitored for symptom development. One mo after placing treated leaflets on uninfested plants, the same treatment was applied to the whole plants and monitored for erinea development on the new flush. Our results showed that none of the treatments were able to control the mites inside the erinea and protect the new flush. The methods described here can be used for more precise evaluations of other acaricides that are urgently needed to control A. litchii in Florida.
{"title":"Evaluation of Abamectin as a Potential Chemical Control for the Lychee Erinose Mite (Acari: Eriophyidae), a New Invasive Pest in Florida","authors":"A. Revynthi, L. F. Cruz, Maria A. Canon, J. Crane, P. Kendra, C. Mannion, D. Carrillo","doi":"10.1653/024.105.0101","DOIUrl":"https://doi.org/10.1653/024.105.0101","url":null,"abstract":"Abstract The lychee erinose mite, Aceria litchii (Keifer) (Acari: Eriophyidae), is an important pest of lychee (Litchi chinensis Sonn.; Sapindaceae) trees. This minute mite prefers to feed on young, new flush causing the formation of galls called “erinea.” Chemical control to protect the new flush is the primary management approach that has been used to control this mite. Aceria litchii was detected recently in Lee County, Florida, USA, and there is an urgent need to identify an acaricide that can control mite populations. Among the acaricides registered for use on lychee in Florida, abamectin was reported to be effective against A. litchii from other parts of the world. However, it remains unknown whether this acaricide can control the mites inside the erinea effectively and protect the new flush. We investigated whether abamectin alone or in combination with an organosilicone surfactant could control an existing mite infestation. Lychee leaflets that had erinea were sprayed with acaricides, then placed on uninfested plants and monitored for symptom development. One mo after placing treated leaflets on uninfested plants, the same treatment was applied to the whole plants and monitored for erinea development on the new flush. Our results showed that none of the treatments were able to control the mites inside the erinea and protect the new flush. The methods described here can be used for more precise evaluations of other acaricides that are urgently needed to control A. litchii in Florida.","PeriodicalId":12297,"journal":{"name":"Florida Entomologist","volume":"105 1","pages":"1 - 5"},"PeriodicalIF":1.4,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46987333","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}
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