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6 December 2019 Response of Trichogramma spp. (Hymenoptera: Trichogrammatidae) to Insecticides at Concentrations Sublethal to Cnaphalocrocis medinalis (Lepidoptera: Pyralidae)
Yajun Yang, Caiyun Wang, Hongxing Xu, Junce Tian, Zhongxian Lu
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Abstract

Trichogramma japonicum Ashmead (Hymenoptera: Trichogrammatidae) and Trichogramma dendrolimi Matsumura (Hymenoptera: Trichogrammatidae) are important parasitoids of Lepidopteran pests and are used for biological control in rice fields. In this study, the response of two of these parasitoids to four insecticides (chlorpyrifos, chlorantraniliprole, emamectin benzoate, and spinosad) were evaluated at target sublethal concentrations (TSC10 and TSC25, representing the LC10 and LC25 to the target pest) of the important rice pest, Cnaphalocrocis medinalis (Guenée). Each of the insecticides led to the mortality of adult T. japonicum and T. dendrolimi at TSC10 and TSC25, whereas no significant differences in the mortality of T. japonicum between TSC10 of chlorantraniliprole and control groups occurred. The parasitic capacity increased at F0 of T. japonicum at the two TSCs of spinosad treated host eggs, whereas the TSC10 was lower for emamectin benzoate at F1 for T. japonicum. The TSCs of chlorpyrifos treated host eggs negatively influenced the emergence rates of T. japonicum at F1. Emamectin benzoate with TSC10 reduced the female ratio of T. japonicum at F1. For T. dendrolimi, the TSCs of chlorpyrifos treated host eggs negatively influenced the emergence rates at F1. These findings indicate that T. japonicum and T. dendrolimi are affected by insecticides at TSCs, and among the four insecticides, chlorantraniliprole had the lowest mortality rates for T. japonicum and T. dendrolimi at TSCs.

© The Author(s) 2019. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.
Yajun Yang, Caiyun Wang, Hongxing Xu, Junce Tian, and Zhongxian Lu "Response of Trichogramma spp. (Hymenoptera: Trichogrammatidae) to Insecticides at Concentrations Sublethal to Cnaphalocrocis medinalis (Lepidoptera: Pyralidae)," Journal of Economic Entomology 113(2), 646-653, (6 December 2019). https://doi.org/10.1093/jee/toz325
Received: 29 March 2019; Accepted: 14 November 2019; Published: 6 December 2019
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KEYWORDS
chlorantraniliprole
chlorpyrifos
parasitic wasps
rice
target sublethal concentration (TSC)
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