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Rating knockdown of flour beetles after exposure to two insecticides as an indicator of mortality.

Abstract：

: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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Athanassiou CG,Kavallieratos NG,Arthur FH,Nakas CT

doi

10.1038/s41598-020-78982-z

subject

Has Abstract

pub_date

2021-01-13 00:00:00

pages

1145

issue

1

issn

2045-2322

pii

10.1038/s41598-020-78982-z

journal_volume

11

pub_type

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