Timing and Effectiveness of Insecticide Treatments Against the San Jose Scale (Homoptera: Diaspididae)
Authors: Reissig, W. H.; Weires, R. W.; Onstad, D. W.; Stanley, B. H.; Stanley, D. M.
Source: Journal of Economic Entomology, Volume 78, Number 1, February 1985 , pp. 238-248(11)
Publisher: Entomological Society of America
Abstract:Various types of petroleum oil alone, methidathion or chlorpyrifos alone, and combinations of oil with the two insecticides applied as a single dilute spray at the ½-in. green growth stage were all highly effective against overwintering Quadraspidiotus perniciosus (Comstock). During the summer, handgun applications of dilute methidathion, azinphosmethyl, encapsulated methyl parathion, chlorpyrifos, diazinon, methomyl, and fenvalerate effectively prevented fruit infestation when sprays were applied against crawlers. Two applications during each generation of crawlers, one at the beginning and another 10 to 14 days later, provided the best control. In tests conducted in 1983 in the Hudson Valley when materials were applied with airblast sprayers, fruit infestation was considerably more severe in commercial orchards treated with azinphosmethyl than in those sprayed on the same schedule with encapsulated methyl parathion or chlorpyrifos. A SJS forecast model was developed to allow growers to time summer sprays against both crawler generations. Validation trials conducted in 1983 demonstrated that this forecast model was somewhat more reliable in predicting crawler emergence in New York than the Predictive Extension Timing Estimation Model and was sufficiently accurate to be used in practical management programs.
Document Type: Research Article
Publication date: February 1985
- 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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