Vegetable Leafminer and Parasite Emergence from Tomato Foliage Sprayed with Oxamyl12

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Abstract
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.

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