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Dernière mise à jour : Mai 2018

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Institut Sophia Agrobiotech

UMR INRA - Univ. Nice Sophia Antipolis - Cnrs

http://www.paca.inra.fr/institut-sophia-agrobiotech_eng/

Pest Management Science

26 February 2019

Pest Management Science
© © 1999-2019 John Wiley & Sons, Inc.
Selectivity of novel and traditional insecticides used for management of whiteflies on the parasitoid Encarsia formosa

Abstract

BACKGROUND
Encarsia formosa Gahan is the most important parasitoid exploited for the control of whitefly pests of vegetable crops. However, the non‐target effects of recently developed insecticides for controlling whiteflies toward this biocontrol agent is little documented. Here we evaluated the susceptibility of E. formosa adults and juveniles to eight commonly used insecticides against whiteflies.

RESULTS
Residual toxicity tests on glass showed that E. formosa adults were susceptible (over 98% mortality after 6 hours treated) to field concentrations of the tested neonicotinoids (imidacloprid, acetamiprid, nitenpyram and thiamethoxam), abamectin, cyantraniliprole, and sulfoxaflor at their field concentrations. Pyriproxyfen was harmless to both adult and pupae of E. formosa. A risk quotient analysis showed that toxicity of pyriproxyfen to E. formosa adults was the lowest, followed by acetamiprid and cyantraniliprole. In the leaf residues test, mortality of E. formosa adults under all insecticides decreased when the residue age increased. Interestingly, E. formosa experiencing contact with the residues of most insecticides, except pyriproxyfen and abamectin, parasitized significantly more hosts 5‐d after treatment, suggesting a hormetic effect on parasitism.

CONCLUSION
The risk assessment of insecticides indicated that pyriproxyfen and cyantraniliprole were the least toxic to E. formosa. Our results suggest that the inclusion of the insecticides in sustainable integrated pest management (IPM) programs of whiteflies should be carefully evaluated on a case‐by‐case basis.

Keywords

biological control, cyantraniliprole, ecotoxicology, hormesis, integrated pest management, sublethal effects, sulfoxaflor

Wang, Z., Dai, P., Yang, X., Ruan, C.-C., Biondi, A., Desneux, N., and Zang, L.-S. (2019). Selectivity of novel and traditional insecticides used for management of whiteflies on the parasitoid Encarsia formosa. Pest Management Science. DOI: 10.1002/ps.5380

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