Efficacy and Cost Effectiveness of Grain Protectants Applied to Farm-Stored Wheat at Harvest and Later
Authors: REED, C.; PEDERSEN, J. R.; CUPERUS, G. W.
Source: Journal of Economic Entomology, Volume 86, Number 5, October 1993 , pp. 1590-1598(9)
Publisher: Entomological Society of America
Abstract:Studies were conducted in 1989 and 1990 in wheat stored on farms in Kansas and Oklahoma to compare the recommended harvest-time application of grain protectant with a delayed application (4-6 wk after harvest) to a portion of the grain mass. In 1989, chlorpyrifos-methyl was applied by both methods to unaerated wheat. In 1990, the two application procedures were compared as part of an integrated program of insect pest management, and either chlorpyrifos-methyl or malathion was applied. Although the delayed application of chlorpyrifos-methyl appeared to reduce the number of insects captured in probe traps, and produced 98 ± 1.1% mortality when bioassayed after 5 mo of storage, it did not significantly reduce insect density in samples from aerated lots and was not cost effective compared with no grain protectant. When malathion was used, neither the delayed application nor the application at harvest significantly reduced insect density in the stored wheat. Treatment with chlorpyrifos-methyl, either at harvest or later, significantly (P <0.05) reduced insect density in grain samples in fall 1989 compared with the nontreated lots. In both trials, the application of grain protectant at harvest was associated with a greater overall cost index than no protectant treatment.
Document Type: Research Article
Publication date: 1993-10-01
- 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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