Abstract
Three field tests were conducted to determine the effect of Sevin® (1-naphthyl N-methylcarbamate), Dylox® ( O , O -dimethyl 2,2,2-trichloro-1-hydroxyethyl phosphonate), Phosdrin® (a mixture of the alpha isomer of 2-carbomethoxyl-1-methyl-vinyl dimethyl phosphate (not less than 60%) and related compounds (not more than 40%)), methoxychlor, parathion, and demeton on the veg parasite Trichogramma semifumatum (Perkins). The materials were applied at dosages commonly used for controlling various pests of field and vegetable crops in California. Sevin was extremely toxic to the adult parasites, and to the parasites developing within Colias eurytheme Boisduval eggs or to those attempting to emerge from the host egg. Demeton, Dylox, and Phosdrin were not nearly as toxic as Sevin. Phosdrin and Sevin were moderately toxic to Geocoris spp., while Dylox and demeton had less effect. Dylox and Phosdrin were more toxic to Nobis ferus (Linn.) and Orills tristicolor (White) than Sevin.
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