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Vegetable Leafminer and Parasite Emergence from Tomato Foliage Sprayed with Oxamyl

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Two field experiments were conducted to determine the role of oxamyl in the management of Liriomyza sativae Blanchard on tomato. On a regular pesticide schedule, 2 applications/week of oxamyl 2L at 59.9 g AI/100 liters were necessary to reduce the number of L. sativae emerging from treated ‘Floradel’ foliage when sampled over the entire season. However, the number of emerging L. sativae was still above the damage threshold of 1 active mine/3 terminal leaflets. Significant reductions in the number of emerging hymenopterous parasites were observed when treatments were applied at intervals as great as 2 wk. A single application of oxamyl at a rate as low as 30.0 or as high as 119.8 g AI/100 liters or methamidophos at 89.9 g AI/100 liters significantly reduced the number of emerging leafminers without affecting parasite emergence. Reductions of emerging L. sativae below the damage threshold were reached after 1 day for methamidophos and 3 days for the 119.8 and 59.9 g AI/100 liters rates of oxamyl. Oxamyl may best fit a pest management program where sprays are applied as needed based on regular scouting.

Document Type: Research Article

Publication date: April 1, 1979

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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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