Control Tests Against the Two-Spotted Spider Mite, Tetranychus telarius (L.), on Strawberries

Author: SCHAEFERS, G. A.

Source: Journal of Economic Entomology, Volume 58, Number 6, December 1965 , pp. 1089-1094(6)

Publisher: Entomological Society of America

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The two-spotted spider mite, Tetranychus telarius (L.) (=T. urticae (Koch)), although a problem on strawberries throughout New York, is particularly severe in the Hudson valley and Long Island area. Early-season control is essential for protection through the limited harvest period of June-bearing strawberry varieties. Perhaps owing to the variety of spray programs used in the past, no pronounced resistance has developed to the organophosphorous materials as a group. Of the organophosphorous materials tested, phorate provided the most effective control. Very good control was obtained with carbophenothion, particularly when used at a rate of 1.0 pound actual. Tepp, azinphosmethyl, and Niagara 9203 (O,Odimethyl S-[(2-oxo-3-benzoxazolinyl) methyl] phosphorothioate) gave some control but had limited residual effectiveness.

Of 32 materials tested, dicofol was consistently one of the superior materials for the control of this pest. Another chlorinated hydrocarbon. Dimite® (4,4'-dichloro-alpha-methylbenzhydrol), had limited residual effectiveness while Chloropropylate® (isopropyl 4,4-dichlorobenzilatc) was ineffective.

Morestan® (6-methyl-2,3-quinoxalinedithiol cyclic carbonate) gave particularly good control in 2 applications at 0.25 pound actual. This material resulted in plant injury following some applications but not others.

The carbamate Bayer 37344 (4- (methylthio) -3,5-xylyl methylcarbamate) provided fair control against recently hatched mites. A second carbamate, Union Carbide 20047A [5-chloro-6-oxo-endo-2-norbornanecarbonitrile O- (methyl-carbamoyl) oxime], appeared particularly promising.

Tetradifon (miscible) and tetrasul (p-chlorophenyl 2,4,5-trichlorophenyl sulfide) were unsatisfactory while OW-9 (2-[2-(p-tert-butylphenoxy) -1 -methylcthoxy]-1-methylethyl 2-chloroethyl sulfite) provided fair control.

Fair control was obtained also with Hoechst 2836 (binapacryl and a halogenated urea derivative), binapacryl, and Union Carbide 19786 (2-sec-butyl-4,6-dinitrophcnyl isopropyl carbonate).

Document Type: Research Article

Publication date: December 1, 1965

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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