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1 February 2013 Susceptibility to Selected Insecticides and Risk Assessment in the Insect Egg Parasitoid Trichogramma confusum (Hymenoptera: Trichogrammatidae)
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Abstract
The parasitoid Trichogramma confusum Viggiani (Hymenoptera: Trichogrammatidae) is an important natural enemy of many lepidopterans throughout the world. Extensive toxicological tests have clarified the toxic effects of insecticides on trichogrammatids, but only few studies have examined these effects on T. confusum. Among the seven classes of tested chemicals, organophosphates and carbamates exhibited the highest intrinsic toxicity to the parasitoid with LC50 values ranging from 0.037 (0.030–0.046) to 0.29 (0.23–0.38) and from 0.17 (0.15–0.19) to 1.61 (1.45–1.79) mg AI L-1, respectively. They were followed by phenylpyrazoles, avermectins, pyrethroids, and neonicotinoids, which induced variable toxicity responses with LC50 values ranging from 0.63 to 45.26, 1.06–21.73, 3.89–19.36, and 0.24–754.2 mg AI L-1, respectively. In contrast, insect growth regulators (IGRs) showed the least toxicity to the parasitoid with LC50 values ranging from 3,907 (3,432–4,531 ) to 10,154 (8,857–12,143) mg AI L-1. A risk quotient analysis indicated that neonicotinoids (except thiamethoxam), avermectins, pyrethroids, IGRs, and phenylpyrazoles are safe, but organophosphates and carbamates are slightly to moderately or dangerously toxic to T. confusum. This study provides informative data for implementing both biological and chemical control strategies in integrated pest management of lepidopterans.
© 2013 Entomological Society of America
Yanhua Wang, Liping Chen, Xuehua An, Jinhua Jiang, Qiang Wang, Leiming Cai and Xueping Zhao "Susceptibility to Selected Insecticides and Risk Assessment in the Insect Egg Parasitoid Trichogramma confusum (Hymenoptera: Trichogrammatidae)," Journal of Economic Entomology 106(1), (1 February 2013). https://doi.org/10.1603/EC12313
Received: 6 August 2012; Accepted: 1 October 2012; Published: 1 February 2013
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