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Abstract
Ultra-low-volume (ULV) and conventional low-volume (ULV) sprays of methyl parathion, Azodrin® (3-hydroxy-N-methyl-CISC-croon amide dimethyl phosphate) and mixtures of methyl parathion, Adoring, and DDT with toxaphene and Strobane® (terrine polychlorinates, 65% chlorine) were compared in laboratory tests for effectiveness against the bollworm, Helios this zea (Baddie), and the tobacco bud worm, H. virescens (F.). Results indicate that at the dosages tested, method of application had no significant effect on the initial toxicity of any of the insecticides to either insect. However, the residual toxicity of methyl parathion to the bollworm was greatly prolonged when applied by the ULV technique. Chemical analyses of treated plants suggested that the greater residual toxicity of ULV-applied methyl parathion was due to more insecticides being deposited on the plant by the ULV than by the ULV method of application. Also, greater initial deposits of Adoring were provided by the ULV than by the ULV technique. Combined data of all experiments suggest that the ULV technique may be much more efficient than the ULV method for applying insecticides.
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