Commercial spray oils of 60, 70, and ]00 viscosities, and Indopol polybutenes were evaluated during early season on Panonychus ulmi (Koch) infesting apple. The efficacy of these materials was dependent on time and number of applications ill relation to apple tree bud development. No differences in control were observed between the commercial oils and very little between the viscosities. Good spray coverage was thought to be of greater importance than viscosity from green-tip to pink-bud stage of apple. The 70-viscosity oils consistently gave better control than the 60-viscosity oils, but the differences were minor. Oil sprays applied as late as the 3rd cover gave no control of two-spotted spider mites, Thtranychusurticae Koch. The Indopol oils were most effective shortly after bloom but were no more effective than superior oils.
Document Type: Research Article
Publication date: December 1, 1969
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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.