Toxicity of five insecticides against Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae), larval parasite of diamonback moth
2002
Laddawan Insang(Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Div. Vegetable and Ornamental Plants Insect Pests Research Group) | Piyarat Khianmisuk(Department of Agriculture, Bangkok (Thailand). Entomology and Zoology Div. Vegetable and Ornamental Plants Insect Pests Research Group) | Uap Sarathoi(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Entomology)
Toxicity of five insecticides: fipronil, chlorpenapyr, abamectin, diafenthiuron and cypermethrin were evaluated against adults and pupae of Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae), the larval parasite of diamondback moth (DBM), Plutella xylostella. The results concluded the fipronil, chlorpenapyr and diafenthiuron were remarkably harmful to adult of C. plutellae, which caused 99 percent mortality of the parasite. Abamectin was moderately harmful to C. plutellae adult which caused 80-99 percent mortality while cypermethrin was slightly harmful, caused 50-79 percent mortality of C. plutellae. All those five insecticideswere observed as harmless to C. plutellae pupae. Studies on effect of those recommended insecticides on the parasitization of C. plutellae adult emerging from treated pupae were also examined. It showed that cypermethrin reduced 27.7 percent in parasitization of C. plutellae while the reduction in parasitization caused by fipronil, chlorpenapyr, abamectin and diafenthiuron were 92 percent, 88.3 percent, 78.1 and 39 percent, respectively. Results obtained during the studies provided more information regarding insecticides selectivity of C. plutellae for consideration in integrated management of DBM and judicious use of insecticides on environment conservation.
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