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TOXICITY AND PERSISTENCE OF PYRETHROID INSECTICIDES AS FOLIAR SPRAYS AGAINST DARKSIDED CUTWORM (LEPIDOPTERA: NOCTUIDAE) ON TOBACCO IN ONTARIO1

Published online by Cambridge University Press:  31 May 2012

H. H. Cheng
H. H. Cheng
Affiliation:
Research Station, Agriculture Canada, Delhi, Ontario N4B 2W9
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Abstract

Toxicity and persistence of six insecticides, including three pyrethroids and three organophosphorus insecticides, against Euxoa messoria (Harris) larvae were evaluated. These insecticides were applied to winter rye or tobacco seedlings in the field, and the residues on the foliage were bioassayed in the laboratory. The pyrethroids, cypermethrin, fenvalerate and permethrin, were more effective and persistent, and killed the larvae more rapidly than the organophosphorus insecticides, sulfopros, chlorpyrifos and trichlorfon. The higher rate of cypermethrin and fenvalerate gave a longer period of protection than the lower rate of the same materials and both materials were persistent longer than permethrin. No visible phytotoxicity was found on the tobacco plants treated directly with sulfopros, trichlorfon, cypermethrin, fenvalerate, and permethrin in the 3 years of tests.

Type
Articles
Information
The Canadian Entomologist , Volume 112 , Issue 5 , 01 May 1980 , pp. 451 - 456
Copyright
Copyright © Entomological Society of Canada 1980

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