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Effect of Strawberry Plant Physiological Status on the Translaminar Activity of Avermectin B1 and Its Efficacy Against the Twospotted Spider Mite (Acari: Tetranychidae)

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Plant physiological status determines translaminar movement of avermectin B1 in strawberry leaves, and the resulting noncontact residual kill of twospotted spider mite, Tetranychus urticae Koch. Significant T. urticae mortality was obtained upon contact with avermectin B1 with and without the addition of dormant oil, and with propargite. Noncontact residual kill of T. urticae by avermectin B1 was greater on fruiting summer-type plants than on plants in winter semidormancy. When avermectin B1 was applied only to the top surface of leaves, addition of dormant oil enhanced T. urticae mortality on lower leaf surfaces of plants in winter semidormancy. T. urticae mortality was not affected by the addition of oil when plants were in either a spring-type vegetative growth state or a summer-type sexual state. The results of this study suggest an explanation for inconsistencies observed in field applications of avermectin B1 for control of T. urticae.

Document Type: Research Article

Publication date: October 1, 1996

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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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