Effect of Various Insecticides in the Control of Caterpillars Attacking Tomato in California

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Abstract
A series of small, replicated plot experiments on tomatoes was Conducted in Central California during 1960 and 1961 to find materials that Could be substituted for DDT in the Program to Control the following caterpillar pests: corn carworm, Heliothis zea (Boddie); tobacco and tomato hornworms, Protoparce sexta (Johannson) and P. qninquemaculata (Haworth); western yellow striped armyworm, Prodenia praefica Grote; beet armyworm, Spodoptera exigua (Hübner) and, rarely in this area and north ward, the pinworm, Keiferia lycopersicella (Busck), of which a heavy infestation built up in several fields in the Stockton area, including our plots. in 1961. Bacillus thuringiensis Berliner proved to be fairly effective against several of the foliage-Feeding caterpillars, such as Prodenia praefica, Protoparce sexta and Trichoplusia ni (Hübner) but failed when Heliothis zea and Keiferia lycopersicella appeared. Of the chemical insecticides, Sevin® (1-naphthyl N-methyl-carbamate) can be substituted for DDT and presented no drift hazard to alfalfa. It was quite effective against all but the pinworm. Guthion® (O, O-dimethyl S-(4-oxo-1,2,3 benzotriazin-3-(4H)-ylmethyl) phosphorodithioate), which has a Federal tolerance on tomatoes but not on alfalfa as yet, looked very promising against all of the caterpillars that are of concern on tomatoes in central and northern California.

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