Insecticide toxic effects on Trichogramma ostriniae (Hymenoptera: Trichogrammatidae)

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 evaluate...

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Bibliographic Details
Published in:Pest management science 2012-12, Vol.68 (12), p.1564-1571
Main Authors: Wang, Yanhua, Chen, Liping, Yu, Ruixian, Zhao, Xueping, Wu, Changxing, Cang, Tao, Wang, Qiang
Format: Article
Language:English
Subjects:
adults
Animals
avermectins
Biological and medical sciences
biological control
Biological Control Agents
carbamates
Control
Fundamental and applied biological sciences. Psychology
insect growth regulators
Insecticides
Insecticides - toxicity
Insects
integrated pest management
Lepidoptera
lethal concentration 50
neonicotinoid insecticides
organophosphorus compounds
parasitoids
Pest control
Phytopathology. Animal pests. Plant and forest protection
Protozoa. Invertebrates
pyrethrins
risk
Risk Assessment
side effects
Toxicity
Toxicity Tests, Acute
Trichogramma
Trichogrammatidae
Wasps - drug effects
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Summary: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 LC₅₀ 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 LC₅₀ 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
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.3343