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Persistence and Degradation of Residues of Ciba C-9491 and Their Control of Fall Armyworms1 and Corn Earworms1,2,3

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Persistence of Ciba C-9491 (O- (2,5-dichloro-4-iodo- phenyl) O,O-dimethyl phosphorothioate), its oxygen an- and its phenol, over 16 days, was determined in 3 plant parts of sweet corn treated with ½, 1, and 2 Ib per of an emulsifiable concentrate of C-9491. Highest residues occurred in stalks and leaves treated with 2 Ib per acre. During the 16 days, residues of G-9491 declined from 50.8 to 3.28 ppm, and those of the O-analogue diminished from 0.086 to <0.005 ppm. Residues of the reached their maximum (4.90 ppm) I day post- treatment and remained rather constant during the ensuing 15 days.

LD50 values for 4-day-old 30-mg larvae of fall armyworm, Spodoptera frugiperda (J. E. Smith) , treated topic- ally with acetone solutions of C-9491, its oxygen analogue, and its phenol were about 1.2, 0.2, and 200 µ.g, respectively. Feeding trials in the laboratory showed that the C-9491 was as good as or better than p,p'-DDT in controlling the larvae. Slightly less effective control of fall armyworms and corn earworms, Heliothis zea (Boddie), was obtained in field plots of sweet com treated 6 times (2- to 3-day intervals) with I Ib per acre C-949 I than in similar plots treated with 2 Ib per acre DDT. The accumulation of residues of C-9491 and the 2 metabolites during these treatments was determined. Also, recoveries of the 3 compounds from field samples were compared by using 2 methods of extraction.

Document Type: Research Article

Publication date: December 1, 1969

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  • 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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