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Control of Oligonychus pratensis Attacking Winter Wheat in Western Kansas1

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A mite, Oligonychus pratensis (Banks), has been causing concera Among wheat growers in western Kansas during recent Years. Heavily infested plants have been killed by a combination of mite feeding and insufficient soil moisture.

In 1958 demeton, Trithion,® parathion, Kelthane,® Guthion,® Tedion® and malathion reduced mite populations significantly 3 days after application but none provided satisfactory control and none was effective 14 days after treatment. In 1959, all materials reduced mite populations 4 days after application but only Trithion, Kelthane, and parathion provided high initial mortality. Demeton gave fair control but Phostex® and Delnav® were ineffective, Trithion and Kelthane were superior to all other materials 14 days after treatment.

Parathion applied at 1.0 lb. per acre by airplane significantly reduced mite populations and gave a substantial increase in seed yield.

Definitions of chemicals bearing proprietary names above arc as follows:

Delnav (2,3-p-dioxanedithiol S,S-bis(O,O-diethyl phosphorodithioate 68%-70% and related materials)).

Guthion (O,O-dimethyl S-( 4-oxo-1, 2,3-benzotriazin-3-( 4H)-ylmethyl) phosphorodithioate).

Kelthane (4,4'-dichloro-alpha-(trichlorometllyl)-benzhydrol).

Phostex (a mixture of bis(dialkyloxyphosphinothioyl) disulfides).

Tedion (2,4,4',5-tetrachlorodiphcnyl sulfone).

Trithion (S-(p-chlorophenylthio)methyl O,O-diethyl phosphorodithioate).

Document Type: Research Article

Publication date: December 1, 1960

More about this publication?
  • 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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