Laboratory Evaluation of Several New Insecticides for Control of the Red backed Cutworm1,2
Author: McDONALD, S.
Source: Journal of Economic Entomology, Volume 65, Number 2, April 1972 , pp. 533-539(7)
Publisher: Entomological Society of America
Abstract:Sixty-two insecticides were evaluated in the laboratory for control of larvae of Euxoa ochrogaster (Guenee). Endrin was used as the reference standard for the selection of replacements for the persitent organochlorine insecticides. Candidate insecticides were selected by screening tests, and all orgnochlorine insecticides tested were effective for control of this species. The reaaction of this species to the carbamates indicated its ability to detoxify most of these compounds. Twenty-three organophosphorus insecticides appeared to be possible substitutes. In comparative oral toxicity tests, Dursban® (O,O-dicthyl O-(3,5,6-trichloro--2-pyridyl) phosphorothioate), was 2 times less toxic than endrin. N-2596 (S-(p-chlorophenyl)-O-ethyl ethylphosphonoditioate) and VCS 506 (O-(-4- bromo-2.5-dichlorophenyl) O methyl phenylphosphonothoate) were 4 times, and AC-47470 (cyclic propylene (diethoxyphosphinyl) dithioimidocarbonate) and phoxim were 5 times less toxic than endrin. Zinophos® (O,O- diethyl O-2-pyrazinyl phosphorothioate), Bay 37289 (O- ethyl O-2,4,5-trichlorophenyl ethylphosphonothioate, AG- 47031 (cyclic ethylene (diethoxyphosphinyl) dithioimidocarbonate), and R-15792 (S-(p-chlorophenyl) O-isobutyl ethylphosphonodithioate) were 7 to 10 times less toxic than the standard.
Simulated field tests in the greenhouse indicated that Dursban (0.14 to 0.56 kg/ha), VCS-506 (0.28 to 0.56 kg/ha), phoxim (0.42 to 0.84 kg/ha) and Bay 37289 (0.56 to 0.84 kg/ha) were as effective as endrin at 0.14 to 0.28 kg/ha when applied as a spray to wheat and bare soil. AC-47470 (0.42 to 0.84 kg/ha) was effective only as a foliage spray, and AC-47031 and Zinophos were ineffective at similar rates. Effects of various soil types on the bioaetivity of the organophosphorus replacements were indicated, and the need for proper timing of application under field conditions was stressed.
Document Type: Research Article
Publication date: April 1972
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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