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Insecticide toxic effects on Trichogramma ostriniae (Hymenoptera: Trichogrammatidae)
Author(s) -
Wang Yanhua,
Chen Liping,
Yu Ruixian,
Zhao Xueping,
Wu Changxing,
Cang Tao,
Wang Qiang
Publication year - 2012
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3343
Subject(s) - trichogrammatidae , toxicology , fipronil , hymenoptera , biology , imidacloprid , parasitoid , toxicity , pharmacology , pesticide , chemistry , botany , agronomy , organic chemistry
BACKGROUND: The parasitoid Trichogramma ostriniae (Pang and Chen) is a major natural enemy of many lepidopterans, but only a few studies have been conducted on the compatibility of biological and chemical controls. In this study, the selectivity of 30 insecticides to T. ostriniae adults was evaluated. RESULTS: Among the seven classes of chemicals tested, organophosphates and carbamates had the highest intrinsic toxicity to the wasp, with LC 50 values ranging from 0.032 (0.029–0.038) to 2.38 (1.91–3.15) mg AI L −1 . They are followed by phenylpyrazoles, avermectins, neonicotinoids and pyrethroids, which induce variable toxicity responses, with LC 50 values ranging from 0.14 (0.11–0.21) to 56.67 (48.94–67.24) mg AI L −1 , from 2.57 (1.85–4.28) to 4.48 (3.34–6.83) mg AI L −1 , from 2.48 (1.80–4.03) to 503.6 (457.6–557.5) mg AI L −1 and from 5.44 (3.95–8.84) to 104.2 (92.48–119.7) mg AI L −1 respectively. The insect growth regulators (IGRs) exhibited least toxicity to the parasitoid. CONCLUSION: Risk quotient analysis classifies neonicotinoids, avermectins, pyrethroids, IGRs and phenylpyrazoles (with the exception of butane‐fipronil and fipronil) as safe agents to the parasitoid, but categorises organophosphates and carbamates as slightly to moderately toxic or dangerous to T. ostriniae . Copyright © 2012 Society of Chemical Industry