The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform
Alan L Knight - One of the best experts on this subject based on the ideXlab platform.
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Sexual biology and mating disruption of orange tortrix, Argyrotaenia citrana (Lepidoptera: Tortricidae)
2016Co-Authors: Alan L KnightAbstract:Studies were conducted to characterize the sexual biology of Argyrotaenia citrana (Fernald) and to evaluate the potential of sex pheromones to disrupt moth communication. Both males and females are sexually active during their first scotophase. Virgin females start calling 3 hrs into scotophase and continue until sumise. Calling frequency by virgins is lower during the flrst than in subsequent nights. Females generally mate once during a scotophase. Calling is reduced after mating for one scotophase and then increases though mated females continue to call less frequently than virgins. Peak calling by mated females is delayed several hours compared with virgins. Females may remate after 1-3 days. Males can mate more than once per scotophase. Oviposition is concentrated during early scotophase. Females laid an average of five egg masses. Communication and mating disruption were evaluated in replicated 0.1 ha plots and 100 m2 field cages treated with field-aged polyethylene tube dispensers releasing 0.7-1.2 mg/d of either (Z)-II-tetradecenyl acetate alone or in a 15: I blend with (Z)-II-tetradecenaL Mating of tethered females in field cages and catches of lure and female-baited traps in small field plots were nearly completely disrupted with the two component blend. Dispensers emitting only the acetate pheromone were less effective in disrupting moth communication in similar tests
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Sexual biology and mating disruption of orange tortrix, Argyrotaenia citrana (Lepidoptera: Tortricidae).
Journal of the Entomological Society of British Columbia, 1996Co-Authors: Alan L KnightAbstract:Studies were conducted to characterize the sexual biology of Argyrotaenia citrana (Fernald) and to evaluate the potential of sex pheromones to disrupt moth communication. Both males and females are sexually active during their first scotophase. Virgin females start calling 3 hrs into scotophase and continue until sunrise. Calling frequency by virgins is lower during the first than in subsequent nights. Females generally mate once during a scotophase. Calling is reduced after mating for one scotophase and then increases though mated females continue to call less frequently than virgins. Peak calling by mated females is delayed several hours compared with virgins. Females may remate after 1-3 days. Males can mate more than once per scotophase. Oviposition is concentrated during early scotophase. Females laid an average of five egg masses. Communication and mating disruption were evaluated in replicated 0.1 ha plots and 100 m2 field cages treated with field-aged polyethylene tube dispensers releasing 0.7-1.2 mg/d of either (Z)-11-tetradecenyl acetate alone or in a 15:1 blend with (Z)-11-tetradecenal. Mating of tethered females in field cages and catches of lure and female-baited traps in small field plots were nearly completely disrupted with the two component blend. Dispensers emitting only the acetate pheromone were less effective in disrupting moth communication in similar tests. Key words: Argyrotaenia citrana ; orange tortrix; leafrollers; Rubus ; mating disruption; sexual behavior
Stephen C. Welter - One of the best experts on this subject based on the ideXlab platform.
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Biological Control Potential of Apanteles aristoteliae (Hymenoptera: Braconidae) on Populations of Argyrotaenia citrana (Lepidoptera: Tortricidae) in California Apple Orchards
Environmental Entomology, 2004Co-Authors: Kathleen R Walker, Stephen C. WelterAbstract:Abstract This study examined the potential role of native parasitoids in suppressing pest populations of Argyrotaenia citrana (Fernald) in coastal California apple orchards. An initial survey of larval and pupal parasitoids of A. citrana found that the most common parasitoids of A. citrana were the braconid Apanteles aristoteliae Viereck and the ichneumonid Exochus nigripalpis subobscurus Walsh that together parasitized 33% of the A. citrana larvae collected. To identify which parasitoid species caused most host mortality, parasitoid-induced mortality was examined more closely using sentinel A. citrana larvae. Small batches of both newly hatched and older (third and fourth instars) larvae were released and recaptured to collect emerging parasitoids. The results suggested that most parasitoid-induced mortality occurred in young larvae attacked by A. aristoteliae. To determine whether A. aristoteliae would be likely to suppress A. citrana populations in apples, further release–recapture experiments were con...
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potential for outbreaks of leafrollers lepidoptera tortricidae in california apple orchards using mating disruption for codling moth suppression
Journal of Economic Entomology, 2001Co-Authors: Kathleen R Walker, Stephen C. WelterAbstract:Two species of leafrollers, Argyrotaenia citrana (Fernald) and Pandemis pyrusana Kearfott, represent serious obstacles to the implementation of mating disruption for control of codling moth in coastal California apple orchards. Larval and adult densities of A. citrana and P. pyrusana and subsequent fruit damage were compared under different codling moth control treatments. Leafroller larval counts and levels of fruit damage were significantly higher in most plots that were untreated or treated only with codling moth pheromone. Leafroller fruit damage levels in these plots were commonly between 10 and 15% at harvest. As summer larval counts were good predictors of fruit damage levels, larval sampling could be a useful tool for predicting leafroller outbreaks. Use of pheromone trapping for A. citrana to detect localized outbreaks within an orchard was not useful and failed to correlate with larval numbers, whereas adult monitoring for P. pyrusana appears more promising. Efforts to implement a codling moth mating-disruption program in California must include changes in strategies for monitoring and controlling leafroller species.
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effects of lure dose on efficacy of pheromone traps for monitoring Argyrotaenia citrana lepidoptera tortricidae in california apple orchards
Journal of Economic Entomology, 1999Co-Authors: Klathleen R Walker, Stephen C. WelterAbstract:This study tested lowering the lure dose of Argyrotaenia citrana (Fernald) pheromone to improve the accuracy of the traps as indicators of larval density (and subsequent fruit damage) within coastal California apple orchards. Different doses of pheromone ranging from 1 to 0.001 mg were tested in commercial apple orchards in 1994 and 1995. Mean weekly trap catches were significantly higher in higher dose traps. However, the proportion of moths caught in higher dose traps versus lower dose traps remained fairly constant within each orchard, suggesting that lower dose traps were attracting moths from the same regional pool of moths as the higher dose traps. No statistically significant relationships were detected between average weekly moth catches using each of the 4 lure doses and A. citrana larval counts in 1995. These results suggest that lowering lure dose will not improve the accuracy of pheromone traps as predictors of A. citrana larval density. The lack of correlations between larval densities and male moth counts is discussed relative to the need to monitor female flight activity.
Ángel Rebollar-alviter - One of the best experts on this subject based on the ideXlab platform.
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Identification, Parasitoids, and Population Dynamics of a Blackberry Leafroller (Lepidoptera: Tortricidae) from Michoacán, Mexico
Southwestern Entomologist, 2014Co-Authors: Ignacio Zúñiga López, Ana-mabel Martínez, Samuel Pineda, Jose Isaac Figueroa, José A. Sánchez, R. N. Williams, Ángel Rebollar-alviterAbstract:Abstract. The blackberry, Rubus sp., crop in the state of Michoacan, Mexico is the second-most important crop after avocado, Persea americana Mill., in relation to value of production and employment. In this study was identified a blackberry leafroller, its parasitoids, and population dynamics in two commercial orchards at Michoacan, Mexico, during the growing seasons of 2007 and 2008. Collected rolled leaves containing larvae and pupae where maintained in a laboratory until leafroller adults and their parasitoids emerged. Population dynamics of moths were determined using wing traps containing the sex pheromone of Argyrotaenia citrana (Fernald) (Lepidoptera: Tortricidae). Numbers of males caught peaked in September and November 2007 at the two locations. After these months, numbers gradually decreased to almost zero during the dry season in 2008. Moths that emerged were identified as Argyrotaenia montezumae (Walsingham) (Lepidoptera: Tortricidae). Of the A. montezumae larvae collected in the field, 38% w...
Kathleen R Walker - One of the best experts on this subject based on the ideXlab platform.
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Biological Control Potential of Apanteles aristoteliae (Hymenoptera: Braconidae) on Populations of Argyrotaenia citrana (Lepidoptera: Tortricidae) in California Apple Orchards
Environmental Entomology, 2004Co-Authors: Kathleen R Walker, Stephen C. WelterAbstract:Abstract This study examined the potential role of native parasitoids in suppressing pest populations of Argyrotaenia citrana (Fernald) in coastal California apple orchards. An initial survey of larval and pupal parasitoids of A. citrana found that the most common parasitoids of A. citrana were the braconid Apanteles aristoteliae Viereck and the ichneumonid Exochus nigripalpis subobscurus Walsh that together parasitized 33% of the A. citrana larvae collected. To identify which parasitoid species caused most host mortality, parasitoid-induced mortality was examined more closely using sentinel A. citrana larvae. Small batches of both newly hatched and older (third and fourth instars) larvae were released and recaptured to collect emerging parasitoids. The results suggested that most parasitoid-induced mortality occurred in young larvae attacked by A. aristoteliae. To determine whether A. aristoteliae would be likely to suppress A. citrana populations in apples, further release–recapture experiments were con...
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potential for outbreaks of leafrollers lepidoptera tortricidae in california apple orchards using mating disruption for codling moth suppression
Journal of Economic Entomology, 2001Co-Authors: Kathleen R Walker, Stephen C. WelterAbstract:Two species of leafrollers, Argyrotaenia citrana (Fernald) and Pandemis pyrusana Kearfott, represent serious obstacles to the implementation of mating disruption for control of codling moth in coastal California apple orchards. Larval and adult densities of A. citrana and P. pyrusana and subsequent fruit damage were compared under different codling moth control treatments. Leafroller larval counts and levels of fruit damage were significantly higher in most plots that were untreated or treated only with codling moth pheromone. Leafroller fruit damage levels in these plots were commonly between 10 and 15% at harvest. As summer larval counts were good predictors of fruit damage levels, larval sampling could be a useful tool for predicting leafroller outbreaks. Use of pheromone trapping for A. citrana to detect localized outbreaks within an orchard was not useful and failed to correlate with larval numbers, whereas adult monitoring for P. pyrusana appears more promising. Efforts to implement a codling moth mating-disruption program in California must include changes in strategies for monitoring and controlling leafroller species.
Ignacio Zúñiga López - One of the best experts on this subject based on the ideXlab platform.
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Identification, Parasitoids, and Population Dynamics of a Blackberry Leafroller (Lepidoptera: Tortricidae) from Michoacán, Mexico
Southwestern Entomologist, 2014Co-Authors: Ignacio Zúñiga López, Ana-mabel Martínez, Samuel Pineda, Jose Isaac Figueroa, José A. Sánchez, R. N. Williams, Ángel Rebollar-alviterAbstract:Abstract. The blackberry, Rubus sp., crop in the state of Michoacan, Mexico is the second-most important crop after avocado, Persea americana Mill., in relation to value of production and employment. In this study was identified a blackberry leafroller, its parasitoids, and population dynamics in two commercial orchards at Michoacan, Mexico, during the growing seasons of 2007 and 2008. Collected rolled leaves containing larvae and pupae where maintained in a laboratory until leafroller adults and their parasitoids emerged. Population dynamics of moths were determined using wing traps containing the sex pheromone of Argyrotaenia citrana (Fernald) (Lepidoptera: Tortricidae). Numbers of males caught peaked in September and November 2007 at the two locations. After these months, numbers gradually decreased to almost zero during the dry season in 2008. Moths that emerged were identified as Argyrotaenia montezumae (Walsingham) (Lepidoptera: Tortricidae). Of the A. montezumae larvae collected in the field, 38% w...