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Toxicity risk of insecticides to the insect egg parasitoid Trichogramma evanescens Westwood (Hymenoptera: Trichogrammatidae)

Toxicity risk of insecticides to the insect egg parasitoid Trichogramma evanescens Westwood (Hymenoptera: Trichogrammatidae)

Pest Management Science 70(3): 398-404

Natural populations of T. evanescens contribute to the control of Lepidopterous pests. The toxic effects of insecticides have been extensively reported on trichogrammatids, but are largely unknown on T. evanescens. In this study, the toxicities of seven classes of chemicals against the parasitoid were investigated. Among them, organophosphates and carbamates exhibited the highest levels of intrinsic toxicity with LC50 values ranging from 0.025 (0.023-0.028) to 2.20 (1.71-3.09) and from 0.040 (0.032-0.053) to 1.84 (1.53-2.30) mg a.i. L-1, respectively. Amongst the phenylpyrazoles, only ethiprole can be considered less toxic in the group. Avermectins, pyrethroids and neonicotinoids were less toxic with LC50 values ranging from 1.29 to 2.57, 2.26 to 14.03 and 1.12 to 239.1 mg a.i. L-1, respectively. In contrast, insect growth regulators (IGRs) showed the least toxicity to the parasitoid with LC50 values ranging from 3383 (2406-5499) to 5650 (4228-8579) mg a.i. L-1. of a risk quotient analysis indicated that neonicotinoids, avermectins, pyrethroids and IGRs were less hazardous, but phenylpyrazoles (except for ethiprole), organophosphates and carbamates were slightly to moderately or dangerously toxic to T. evanescens. Our results provided informative data for implementing biological and chemical control strategies in integrated pest management of lepidopterans.

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Accession: 036872725

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PMID: 23633188

DOI: 10.1002/ps.3571

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