Acetamiprid-Induced Toxicity Thresholds and Population Sensitivity in <i>Trichogramma dendrolimi</i>: Implications for Pesticide Risk Assessment
<i>Trichogramma dendrolimi</i>, a key egg parasitoid for lepidopteran pest control, faces potential risks from neonicotinoid insecticides like acetamiprid used in integrated pest management (IPM). This study evaluated acetamiprid’s acute and sublethal toxicity to <i>T. dendrolimi&l...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
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| Series: | Insects |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4450/16/7/698 |
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| Summary: | <i>Trichogramma dendrolimi</i>, a key egg parasitoid for lepidopteran pest control, faces potential risks from neonicotinoid insecticides like acetamiprid used in integrated pest management (IPM). This study evaluated acetamiprid’s acute and sublethal toxicity to <i>T. dendrolimi</i> and assessed population-level risks via species sensitivity distribution (SSD). Acute toxicity assays using glass-vial residues revealed a 24 h LC<sub>50</sub> of 0.12 mg a.i. L<sup>−1</sup> for adults, three orders of magnitude below the maximum field rate (100 mg a.i. L<sup>−1</sup>). Sublethal exposure (1/2–1/100 LC<sub>50</sub>) significantly reduced parasitism and emergence rates (NOEC = 2.3 μg a.i. L<sup>−1</sup>) but did not affect offspring survival. Acetamiprid also shortened offspring development at 11.5–57.5 μg a.i. L<sup>−1</sup>. SSD analysis identified <i>T. dendrolimi</i> as the most sensitive parasitoid to acetamiprid (HC<sub>5</sub>/HC<sub>50</sub>) = 0.11/5.88 mg a.i. L<sup>−1</sup>), with field rates (30–100 mg a.i. L<sup>−1</sup>) indicating a potentially affected fraction (PAF) of 76.8–97.9%. These findings underscore the need to integrate sublethal effects into pesticide regulations to conserve parasitoid-mediated ecosystem services. |
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| ISSN: | 2075-4450 |