Control of Pea Enation Mosaic in Peas with Insecticides1

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In 1955 foliage applications of parathion and demeton were tested on Perfection and Pluperfect varieties of peas in four plantings at two locations. Three applications of parathion applied at weekly intervals reduced the incidence of pea enation mosaic (PEM) in most instances. Other treatments (two applications of parathion 10 days apart; one application of parathion followed l0 days later with demeton; two applications of demeton) gave more variable results depending upon the timing of the first application. The nonpersistent types of virus diseases (stunt and streak) were controlled, when they were prevalent in the same manner as PEM. Increased yields were obtained in the treated plots but not always of the magnitude expected from the degree of virus disease control obtained. In 1956, two tests were conducted on Pluperfect peas using foliage applications of parathion and Diazinon® (O, O-diethyl O-(2-isopropyl-4-methyl-6-pyrimidinyl)phosphorothioate) in combination with seed treatll1ents with demeton. Three applications of Diazinon or parathion were the most effective although the results were not as spectacular as in 1955. This ineffectiveness is attributed to poor timing of the first application. Demeton seed treatment appeared to reduce pea stands. Yield increases were usually obtained with the insecticidal treatment but these increases often were not as sizable us the degree of virus control obtained would indicate.

Document Type: Research Article

Publication date: February 1, 1961

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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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