Toxicity of insecticides used in wheat to adults of Aphidius rhopalosiphi DeStefani-Perez (Hymenoptera: Aphidiidae) with field treated plants
- Jansen, J.P. (2001). Toxicity of insecticides used in wheat to adults of Aphidius rhopalosiphi DeStefani-Perez (Hymenoptera: Aphidiidae) with field treated plants. IOBC/wprs Bulletin, 24: (4), 17-24.
|Title||Toxicity of insecticides used in wheat to adults of Aphidius rhopalosiphi DeStefani-Perez (Hymenoptera: Aphidiidae) with field treated plants|
|Label||jansen 2001 tap 522|
|Endnote Keywords||bifenthrin|biological control agents|cyfluthrin|cypermethrin|deltamethrin|esfenvalerate|fecundity|fluvalinate|insecticides|lambda-cyhalothrin|mortality|natural enemies|nontarget effects|nontarget organisms|parasitoids|persistence|pirimicarb|toxicity|wheat|
|Abstract||The effects of 8 insecticides used in wheat to control cereal aphids were assessed on adults of the parasitic wasp A. rhopalosiphi using a semi-field test design. Products were applied at their maximum field rate recommended in Belgium on small plots of wheat. Directly after treatment, plants were sampled randomly and brought back to the laboratory to form the exposure units where adult wasps were released. Units were placed outdoor and surviving females were collected 24 h later and assessed for fecundity in the laboratory. Mortality and fecundity were used to estimate the reduction of beneficial capacity, compared to the control. Products were rated according to IOBC standards. To assess duration of harmful effects, experiments with products that were initially toxic were repeated in the same way sampling plants either 1 or 3 days after pesticide application. Exposure of wasps to plants treated with cyfluthrin, cypermethrin, fluvalinate, lambdacyhalothrin and pirimicarb lead to less than 25% control corrected mortalities. Mortalities higher than 25% were obtained for bifenthrin, deltamethrin and esfenvalerate. Mortalities were reduced to less than 25% with deltamethrin and esfenvalerate one day after treatment, but were still higher than 25% for bifenthrin. However, no effects were detected with this compound 3 days after treatment. From these results, it can be concluded that exposure of wasps to field treated ear and last leaves of wheat was either harmless or short persistent. Harmful effects observed at day 0 did not last for more than 1 or 3 days.|
|Notes||Cited Reference Count: 24 ref.Journal article, Conference paperEnglish|
|Author address||Laboratoire d'Ecotoxicologie, Ministry of Agriculture, Agricultural Research Centre, Gembloux, Department of Biological Control and Plant Genetic Resources, Chemin de Liroux 2, B-5030 Gembloux, Belgium.|