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The Use of Phorate to Control Aphids and the Hessian Fly on Winter Wheat1

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Abstract:

Field experiments were conducted from 1957 through 1959 to determine the effect of phorate in controlling insects on wheat. A randomized block design with all trea tments replicated four times was used. Plots were seeded with a grain drill and harvested with a combine. Few insects infested the plots in 1957, but in 1958, heavy infestations of the hessian fly, Phytophaga destructor (Say), the apple grain aphid, Rhopalosiphum fitchii (Sand.), and the English grain aphid, Macrosiphum granarium (Kby.), were encountered. Phorate was applied as a seed treatment to control these insects in the rail. To control the spring brood of hessian fly and also aphids that might infest the plots, granulated phorate was broadcast in early April. Experiments were also conducted to determine the effect of the seed treatment under simulated conditions of grazing by clipping.

The phorate seed treatments caused significant losses in stand through reduced germination. However, such losses were not re fleeted in reduced yields. Both hessian fly and the aphids were controlled with a seed treatment of 0.5 lb. of phorate per 10C 1bs. of seed. The spring brood of hessian fly was controlled by granulated 10% phorate broadcast at the rate of 1.75 lbs. 01 toxicant per acre. Highly significant increases in yield were obtained with all treatments where insects were controlled. AI: plots clipped to simulate fall grazing yielded from 4 to 6 bushel! more per acre regardless of treatment.

Document Type: Research Article

Publication date: April 1, 1960

More about this publication?
  • 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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