Comparison of Single and Combined Insecticides for Control of Tomato Pinworm in Florida12

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Abstract
Three replicated field experiments were conducted during 1972–73 to find insecticides or combinations of insecticides to control Keiferia lycopersicella (Walsingham) on tomato. Granular insecticides in general did not perform as well as most spray materials for reduction of tomato pinworm mines and larvae in tomato transplants. Acephate, diazinon, endosulfan, and methomyl kept seedlings nearly mine-free but greatest larval mortality was observed with azinphosmethyl, demeton, and phosalone. Chlordimeform was phytotoxic to seedlings but when sprayed alone or combined with Bacillus thuringiensis Berliner gave good pinworm control without phytotoxicity to field plants. In general, all insecticides applied as tank mixes reduced fruit loss by pinworm when compared to the check. Combinations containing acephate, leptophos, or methomyl provided superior control to combinations containing B. thuringiensis or carbaryl. No correlation was evident among leaves mined, presence of larvae, and fruit lost. Due to the larval habit of movement to new foliage and fruit, an active insecticide residue appeared essential to sustain damage free fruit.

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