Experiments with Aerosols Against Some Pests of Truck Crops1

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Abstract
The toxicity of DDT aerosols was observed in field treatments on 31 spp. of insects attacking vegetable crops or predators on these insects. Many of the plant pests, including the onion thrips (Thrips tabaci), the potato flea beetle (Epitrix cucumeris), the tarnished plant bug (Lygus pratensis), the spittle bug (Philaenus leucophthalmus), the aster leafhopper (Macro-steles divisus), the garden webworm (Loxostege similalis), the eggplant lacebug (Gargaphia solani), the potato aphid (Macrosiphum solanifolii), and lepidopterous larvae were found susceptible. Among the resistant spp. were the harlequin cabbage bug (Murgantia histrionica), the squash bug (Anasa tristis), the Mexican bean beetle (Epilachna vari-vestis), coccinellid adults and larvae, and syrphid larvae. The aerosols containing nicotine generally gave lower kills or were ineffective, while most of those containing derris resins were ineffective. The heavy DDT aerosols, producing larger droplets, were generally more effective than the lighter aerosols. Against most insects aerosols containing 5% DDT, when efficiently applied, were practically as effective as those containing 10% DDT. A canopy on the applicator to allow for distribution of the aerosol and prevent wind drift increased efficiency of the treatment in most cases. No plant injury occurred except on lima beans and snap beans treated with DDT aerosols containing high proportions of cyclohexanone.

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