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Chemical Control of the Onion Maggot in Onions Grown from Seed in Various Types of Soil in Northwestern North America in 1955 and 19561

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In duplicated experiments in 1955 in British Columbia, Idaho, Oregon,and washington, the chlorinated hydrocarbons, dicldrin, heptachlor,and isodrin, however applied, gave economic control of the onion maggot (Hylemya antique (Meig.)) under irrigated conditions in the interior of British Columbia and Idaho, but malathion a1lowed as much damage as in the untreated plots. In western washington and western Oregon, neither dicldrin nor heptachlor gave economie control, but isodrin and malathion warranted further investigation. In plots in which formaldehyde was dripped into the furrow against onion smut in Oregon muck soil, Fewer seedlings emerged than in those for which the seed was treated with thiram. At three localities, where emulsible inseticides were applied as drenches to the seed furrow, fewer seedlings emerged than where wettable powders and dusts were applied. At the Fourth site this difference was not so apparent. In similar experiments in 1956 furrow and seed treatments, with dieldrin, endrin, and heptachlor allowed 0.8% maggot damage in onions in a sandy clay loam and 5.1% in a peat soil in the interior of British Columbia, but malathion gave no more protection than plots left untreated. In muck soil in western Oregon, damage in the untreated plots was 47.3%, but malathion allowed only 4.2 to 7.7% loss and endrin 5.7 to 14.4%. The results indicate that soil types or conditions influence the effectiveness of insecticides markedly. In western Washington and in Idaho in 1956, none of the treatments were satisfactory, damage ranging from 75 to 100% and from 38 to 71% respectively; these results suggest at least that strains of the maggot resistant to these insecticides were developing.

Document Type: Research Article

Publication date: October 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.
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