Lavoratory tests were conducted to evaluate the toxic effect of the four foliar spray insecticides,
Bacillus thuringiensis preparation (BT), chlorfluazuron, phenthoate (PAP), and ethophenprox against three species of carabid beetle adults,
Amara (Amara) chalcites, Poecilus planicollis, and
Anisodactylus signatus. Young roots of the Japanese radish,
Raphanus sativus, were dipped for 10 seconds in an aqueous insecticide solution. Ten adult beetles were kept in a large glass petri dish containing a young radish root, with the following results:(1) Bt and chlorfluazuron showed no insecticidal activity in any species.(2) Ethophenprox showed a strong knockdown effect in all species.(3) PAP showed no insecticidal activity toward
P. planicollis or
A. signatus but induced 100% mortality in
A. chalcites.(4) In the test for
A. chalcites adults, severe damage was observed to the young roots of the radish. No injury was observed from
P. planicollis and
A. signatus. These results suggest that
A. chalcites is the only species damaging radish roots.
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