Effect of Droplet Size on Persistence of ULV Malathion and Comparison of Toxicity of ULV and EC Malathion to Tobacco Bud worm Larvae1


Source: Journal of Economic Entomology, Volume 62, Number 1, February 1969 , pp. 90-94(5)

Publisher: Entomological Society of America

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This study was undertaken to compare persistence of several droplet sizes of ULV malathion applied to cotton leaves, and to compare the acquisition of malathion by 3rd-in star Heliothis virescens (F.) larvae placed on leaves treated with various sizes of malathion ULV droplets or an Fe formulation. The data indicated that the smaller droplets penetrated the leaf cuticle faster than larger droplets and that a greater percent of the malathion was found il'1the internal fraction. In addition, it was found that a O.8-in. simulated rainfall washed off a greater percentage of larger droplets than of smaller droplets. Mortality of larvae placed on cotton leaves treated with the small ULV malathion droplets was higher than larvae on leaves treated with larger ULV droplets or the EC formulations. The short distance between the smaller ULV droplets accounted for the higher mortality. The low mortality of larvae placed on leaves sprayed with larger ULV droplets was due to the ability of the larvae to detect and avoid the droplets. The low mortality of larvae on the EC-treated leaves was due to the drier nature of the malathion on the leaf surface, which was less readily re- moved by larvae crawling over the leaf. Results indicated that in time a behavioral type of resistance to ULV-applied insecticide could develop.

Document Type: Research Article

Publication date: February 1, 1969

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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