Journal of Entomological Science (2007) 42, 11-19

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Isabelle Lauzière and Gary Elzen (2007)
Effect of formulated insecticides on Homalodisca vitripennis (Germar) (Hemiptera: Cicadellidae) and its parasitoid Gonatocerus ashmeadi Girault (Hymenoptera: Mymaridae)
Journal of Entomological Science 42 (1), 11-19
Abstract: Eleven insecticides were tested using a bioassay of foliar insecticide residue to evaluate their impact on Homalodisca vitripennis nymphs and adults and on Gonatocerus ashmeadi parasitoid pupae and newly-emerged adults. Most compounds caused 100% mortality of H. vitripennis nymphs and adults within the first 24 h following exposure. Dimethoate was significantly less toxic to the nymphs than the other compounds. The insect growth regulators buprofezin and pyriproxifen caused high mortality levels at the end of the 72-h period of observation. They were efficacious against both the H. vitripennis nymphs and adults. Thiamethoxam, acetarniprid, cyfluthrin, fenpropathrin and endosulfan severely affected the immatures and newly-emerged adults of the parasitoid G. ashmeadi with total percent mortality exceeding 65%. Piriproxifen, methomyl, imidacloprid and carbaryl were moderately toxic to the parasitoid pupae and young adults (34-55% total mortality); whereas treatments using buprofezin or dimethoate allowed >89% survival of the parasitoids. These results may help predict the reliability of these compounds in the field and risks to natural enemies associated with their use. It is possible, however, to choose insecticides that are more selective in toxicity to the glassy-winged sharp-shooter than to its natural enemies.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Isabelle Lauziere

Research topic(s) for pests/diseases/weeds:
control - general
health/environmental effects of pesticides
Research topic(s) for beneficials or antagonists:
resistance to pesticides

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Homalodisca vitripennis U.S.A. (mid S)
Cosmocomoidea ashmeadi (parasitoid) Homalodisca vitripennis