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Crown-applied Systemic Acaricides for Control of the Twospotted Spider Mite and Hop Aphid on Hops

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Eight systemic insecticides were tested during 1966–70 for control of the twospotted spider mite, Tetranychus urticae Koch, and the hop aphid, Phorodon humuli (Schrank), in field plots of hops. One application (6.4 kg) or 2 applications spaced 8 wk apart (3.2 kg) of aldicarb/ha gave satisfactory control of both pests. Increased yield of hop cones was ca. three 200-lb bales/acre over the untreated check. Phorate and disulfoton controlled aphids but not mites. Dimefox did not control mites and was not evaluated against aphids. The remaining compounds HERC 17413 (O, O-dimethyl phosphorodithioate S-ester with 3-(mercaptomethyl) -l-methylhydantoin)), HERC 18526 (O,O-dimethyl phosphorothioate S-ester with 3-mercaptomethyl)-l-methylhydantoin), TAR-TANĀ® (S- (((1-cyano-l-methylethyl) carbamoyl) methyl) O,O-diethyl phosphorothioate), and BAY 68138 (Ethyl 4-(methylthio)-m-tolyl isopropylphosphoramidate) were ineffective for control of mites or aphids.

Document Type: Research Article

Publication date: October 15, 1975

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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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