Abstract
In laboratory tests, 5 pyrethroid insecticides, FMC 45498 ((S)-alpha-cyano-3-phenoxybenzyl-(R)- cis -2-(2,2-dibromovinyl)-3,3-dimethylcyclopropanecarboxylate), pennethrin (ICI PP 557), Shell WL 41706 ((±)-alpha-cyano-3-phenoxybenzyl 2,2,3,3-tetramethylcyclopropanecarboxylate), Shell WL 43467 ((±)-alpha-cyano-3-phenoxybenzyl (±)- cis . trans -2-(2,2-dichlorovinyl)-3,3-dimethylcyclopropanecarboxylate), and Shell WL 43775 ((±)-alpha-cyano-3-phenoxybenzyl (±)-2-(4-chlorophenyl)-3-methylbutyrate) were all more toxic by direct contact than chlorpyrifos to 3rd instar darksided cutworm, Euxoa messoria (Harris). Permethrin, WL 41706, WL 43775, and WL 43467 were all more toxic than chlorpyrifos to 3rd-instar black cutwonn, Agrotis ipsilon Hufnagel), and a white cutworm, E. scandens (Riley). In other laboratory tests, permethrin, WL 41706, and WL 43775 EC were effective against 4th-5th instar darksided cutworm at application rates as low as 70 g AI/ha, compared to chlorpyrifos at 560 g AI/ha, when applied to rye foliage or the surface of moist sand. The pyrethroids and chlorpyrifos were less active against the darksided cutworm when applied to dry sand. In microplot field tests, permethrin, WL 41706, and WL 43775 controlled the 3 species of cutworms at rates as low as 70 g AI/ha when applied as rye foliage, preplanting soil surface, and postplanting treatments. Equivalent control was obtained with chlorpyrifos at 560–1120 g AI/ha. No residues of permethrin, WL 41706, WL 43775, or chlorpyrifos were detected on tobacco or onions 57 and 83 days, respectively, after treatment. Residues of the pyrethroids(<;0.1 ppm) and chlorpyrifos (0.2 ppm) were detected on asparagus 1 wk after treatment. Comparison of these and other studies indicated that permethrin, WL 41706, and WL 43775 were ca. 16 and 64X more effective than chlorpyrifos and DDT, respectively, for cutworm control.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
