A useful new insecticide bioassay using first-instar larvae of a net-spinning caddisfly, Cheumatopsyche brevilineata (Trichoptera: Hydropsychidae)

Atsushi Yokoyama; Kazuhisa Ohtsu; Takashi Iwafune; Takashi Nagai; Satoru Ishihara; Yuso Kobara; Takeshi Horio; Shozo Endo

doi:10.1584/jpestics.G08-26

Original Articles

A useful new insecticide bioassay using first-instar larvae of a net-spinning caddisfly, Cheumatopsyche brevilineata (Trichoptera: Hydropsychidae)

Atsushi Yokoyama, Kazuhisa Ohtsu, Takashi Iwafune, Takashi Nagai, Satoru Ishihara, Yuso Kobara, Takeshi Horio, Shozo Endo

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Keywords: caddisfly, lotic environment, acute toxicity, insecticide, neonicotinoid, ecological risk assessment

JOURNAL FREE ACCESS

2009 Volume 34 Issue 1 Pages 13-20

DOI https://doi.org/10.1584/jpestics.G08-26

View "Advance Publication" version (December 30, 2008).

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Abstract

A new insecticide bioassay for assessing the effects of acute insecticide toxicity on lotic insects was developed. It uses first-instar larvae of a net-spinning caddisfly, Cheumatopsyche brevilineata. The test method was suitable for 30 insecticides with a range of action mechanisms. Caddisfly larvae were much more sensitive than daphnids to neonicotinoids. The new bioassay is thus a useful and reliable method for assessing the impact of chemicals such as neonicotinoids, whose risks for lotic insects might be underestimated by the daphnid bioassay.

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