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The Use of Systemic Insecticides on Potted Chrysanthemums in the Greenhouse1

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Four series of experiments to control the two-spotted spider unite, Tetranychus telarius (L.), with systemic insecticides applied only on the soil show significant results. Test plants were potted chrysanthemums grown in a greenhouse under usual commercial conditions.

Demeton at the rate of 32 milliliters of the commercial preparation in 32 gallons of water per 100 square feet of soil surface protected the plants from mites for approximately 5 weeks. Ten per cent phorate granules at the rate of 2.50grams per 100 square feet required 1 week to become effective, but usually protected the plants from mites until blooms appeared. It was the most effective chemical tested in control of flower thrips, Frankliniella tritici (Fitch). Phosphamidon and Zectran® (4-dimethylarnino-3. 5-xylyl methylcarbamate) remained effective in control of mites for a shorter period of time than phorate, and a stronger dosage of granules of Di-Syston® (O,O-diethyl S-[2-(ethy]thio)ethyl] phosphorodithioate) was required to control mites adequately. Dimethoate burned the plants severely at all concentrations used.

Document Type: Research Article

Publication date: August 1, 1962

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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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