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Showing 1 to 11 of 11 for “"Hypera postica"”.
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Mating behavior of the alfalfa weevil, Hypera postica (Gyllenhal)
The qualitative and quantitative aspects of mating behavior, the stimulus for locating and mating, and the effects of varying temperatures on mating behavior and oviposition were studied in the laboratory. Postdiapausing weevils, collected in April, and nondiapausing weevils, reared in the …
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Population dynamics of overwintering life stages of the alfalfa weevil, Hypera postica (Gyllenhal)
Virginia is a natural laboratory for studying overwintering habits of the alfalfa weevi1. At higher elevations, winters are relatively harsh and weevil pressure on the alfalfa crop is usually light. Much heavier pressure is the rule at lower elevations where winters are milder. The goal of this …
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Studies of the effects of apholate on the alfalfa weevil, Hypera Postica (Gyllenhal)
… on diapausing and nondiapausing alfalfa weevil, Hypera postica (Gyllenhal), were studied. Different stages, sexes, and ages of the weevil were treated with aqueous-apholate solution. Adult topical application and larval and adult dipping methods were used in the experiment. Both showed the …
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Development of female sex organs during aestivation in the alfalfa weevil, Hypera postica (Gyll.) (Coleoptera, Curculionidae)
Laboratory studies and field observations were conducted to ascertain the development of the female sex organs of the alfalfa weevil during aestivation, to study the role of this aestivation on sexual development, and to investigate the factors responsible for this interaction. Measurements of …
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The determination of log-time mortality curves of the various life stages of (Hypera postica) subjected to certain insecticides
The purpose of this investigation was to test three insecticides on all the life stages of the alfalfa weevil. The objectives were to obtain information on the toxicity of certain insecticides on the alfalfa weevil in the laboratory, to establish standard susceptibility curves of the life stages of …
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Development, implementation, and economic evaluation of an integrated pest management program for alfalfa in Virginia
… abundance of alfalfa weevil (AW) larvae (Hypera postica Gyllenhal) were evaluated for both accuracy and precision. Calibration equations were developed to convert intensity estimates of AW larvae among sampling methods. Greenhouse experiments evaluating the interaction of moisture stress …
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Population dynamics, mortality factors, and pest status of alfalfa weevil in Virginia
The alfalfa weevil, Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), remains a serious pest in Virginia despite being under complete biological control in the northeastern U.S. In 1996, a survey of 187 alfalfa fields in Virginia was initiated to determine the current pest status of alfalfa …
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Combined Roles of Glandular-haired Alfalfa and Natural Enemies in Alfalfa Pest Managment in Virginia
Both alfalfa weevil, <i>Hypera postica</i> (Gyllenhal), (Coleoptera: Curculionidae), and potato leafhopper, <i>Empoasca fabae</i> (Harris), (Homoptera: Cicadellidae), remain key pests of alfalfa in Virginia. Commercial varieties of potato leafhopper-resistant (or glandular-haired) alfalfa were …
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Genomic insights into the evolution of the parasitoid Microctonus aethiopoides
… strains collected from three different hosts (Hypera postica, Sitona discoideus, S. obsoletus) and geographically distinct regions, this study investigates how host use and geography shape genomic structure. Comparative genomics reveals a clear host-associated phylogenetic split, with the H. …
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Molecular and Field Analyses of Bathyplectes spp. (Hymenoptera: Ichneumonidae) in Alfalfa Systems in Virginia
… classical biological control of alfalfa weevil, Hypera postica (Coleoptera: Curculionidae). Adults of both species are morphologically similar, generally described as wasps ≈3-4 mm long with black, robust bodies. The Bathyplectes spp. occupy sympatric ranges throughout much of the United States …