Conservation Biological Control of Rosy Apple Aphid, Dysaphis Plantaginea (Passerini), in Eastern North America

摘要: Because of the potentially serious damage rosy apple aphid, Dysaphis plantaginea (Passerini) (Homoptera: Aphididae), can cause to fruit and branch development, prophylactic insecticides are often used for control. If biological control could be relied on, amount pesticide applied in orchards reduced. This study examined aphid eastern West Virginia potential enhancement through conservation control, particular, effect interplanting extrafloral nectar-bearing peach trees. By 20 d after first bloom, only 2% fundatrices initially present survived form colonies based on regression data from 687 colonies. Exclusion studies showed that many early were probably destroyed by predation; major predator responsible seemed adult Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae). Mortality before bloom was most important controlling population growth but itself is not sufficiently reliable prevent economic injury. Interplanting trees did increase with 50% nectar glands reduced The number leaf curl interplanted lower than monoculture orchards, suggesting a preference alate oviparae more diverse habitats, supporting resource concentration hypothesis at level sufficient Predation parasitism formation adequate populations.