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Rating knockdown of flour beetles after exposure to two insecticides as an indicator of mortality
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Rating knockdown of flour beetles after exposure to two insecticides as an indicator of mortality
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Journal Article
Rating knockdown of flour beetles after exposure to two insecticides as an indicator of mortality
2021
Overview
Knockdown and mortality of adults of the red flour beetle,
Tribolium castaneum
(Herbst) and the confused flour beetle,
Tribolium confusum
Jacquelin du Val, were assessed after exposure to two contact insecticides, chlorfenapyr and cyfluthrin, on a concrete surface. Individuals were rated on a scale for knockdown of exposed adults according to their mobility from 1, representing immobilized adults to 5, representing normally moving (similar to the controls). Only cyfluthrin gave immediate knockdown. Adults were rated at 1, 3 and 7 days post-exposure. After the final assessment, adults were discarded and the same procedure was repeated for 5 consecutive weeks with new adults exposed on the same treated surfaces. Despite initial knockdown, many individuals did not eventually die after exposure to cyfluthrin. In contrast, adults exposed to chlorfenapyr were not initially knocked down after exposure but most died after 7 days. These trends were similar during the entire 5-week residual testing period. The storage of the treated dishes in illuminated or non-illuminated conditions did not affect the insecticidal effect of either insecticide. The results of the present study can be further implemented towards the design of a “lethality index” that can serve as a quick indicator of knockdown and mortality rates caused after exposure to insecticides.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
