Massive dosages of five insecticides, DDT, BHC, chlordane, toxaphene, and parathion, and a fungicide, Arasan, were applied to soil and disked in with a rotary hoe. Kenland, Midland, Wisconsin Mildew Resistant, and Michigan Common varieties of medium red clover were planted in the insecticide-treated soils. The best agronomic, cultural, and insect- and disease-control practices were followed. Insect populations of the crop year on July 11, 1951, showed marked differences among the treatments, particularly for grasshoppers, aphids, Diptera, and Hymenoptera. Differences that were highly correlated with data taken the following year occurred in stand among the various treatments in the seeding year. The effect of BHC in reducing the stand of grasses and the companion oat crop was marked. Highly significant differences in stand were present in the spring of the crop year. Yields when corrected for stand differences were significantly affected. Second-crop forage yields showed notable differences among the varieties, with Kenland outstandingly good. The BHC plots produced the highest yields. The final stands on October 17, 1951, showed that plots treated with BHC or with a mixture of insecticides maintained the stand best for all varieties, but were particularly effective for Wisconsin Mildew Resistant and Midland. Kenland went into the second winter with an 84% stand.
Document Type: Research Article
Publication date: December 1, 1959
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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.