Residues of Velsicol VCS-506: Their Persistence and Degradation in Forage Corn^1,2

Authors: LEUCK, D. B.; BOWMAN, M. C.; MORGAN, L.W.; MCCORMICK, W. C.

Source: Journal of Economic Entomology, Volume 62, Number 6, December 1969 , pp. 1458-1462(5)

Publisher: Entomological Society of America

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Abstract:

Two fields of forage corn of different average plant heights (5-6,ft and 8-10 ft) were each treated with Velsicol VCS-506 (O- (4.bromo-2,5-dichlorophcnyl) O-methyl phenylphosphonothioate) emulsifiable concentrate at 0.5, 1.0, and 2.0 Ib per acre and sampled immediately after the sprays had dried and I, 2, 7, 14, and 21 days later. Residucs of VeS-506, its oxygen analogue, and phenol were determined in whole corn plants, ears (husks and silks removed) , and in jar silage.

Residues of VCS-506 in the 5- to 6-ft corn plants treated with 2 Ib per acre diminished from 52.2 to 11.5 ppm during the 21-day weathering period, while the phenol increased from 2.88 to 8.88 ppm; residues of the oxygen analogue were generally less than 0.1 ppm. Residues in the corn treated with 0.5 and 1.0 Ib/acre were proportionally lower. The 5- to 6-ft corn contained more than twice the amounts of residues found in the 8- to 10-ft plants.

Only traces (0.01 ppm or less) of VeS-5OU were found in the corn ears up to 2 days after treatment. Residues of VeS-506 and the phenol in corn ensiled in glass jars for 30 days were relatively stable. However, the low levels of oxygen analogue essentially disappeared.

Document Type: Research article

Publication date: 1969-12-01

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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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