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Developments in Control of the Grape Mealybug

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Among the developments in commercial programs for control of the grape mealybug, Pseudococcus maritimus (Ehrhorn), was the use of dormant oil-parathion concentrate combination sprays. In one trial with such sprays, a concentrate containing an unknown solvent, a xylene base concentrate, and a water flowable emulsion concentrate showed decreasing effectiveness in the order given. Dormant oil increased the effectiveness of the concentrates alone in the reverse order. In a later trial, no differences in effectiveness were detected between two emulsifiable concentrates which represented the widest price differential obtainable. The combination dormant spray of parathion emulsifiable concentrate and sodium arsenite gave control of both mealybugs and black measles equal to parathion and oil for the insects or sodium arsenite for the vine disease. The carryover of control into the second year after dormant treatment was greater on younger vines with less bark and for higher dosages of parathion. In certain areas where mealybugs have been a recurring problem, both dormant sprays and summer dusts of parathion showed reduced effectiveness after 4 to 6 years.

Document Type: Research Article

Publication date: June 1, 1964

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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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