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A Technique for Observing the Spray Pattern of Malathion and Other Organic Phosphate Insecticides Using Spray-Deposit Assessment Cards

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As the interest in the studying of spray patterns and drifts from pesticide application increases, there is a need for a rapid and simple technique with sufficient sensitivity to observe the distribution and deposition of very small droplets. The glass-slide techniques for determining the size and distribution of minute droplets are too complex and time consuming for use in field evaluation. The current assessment-card methods of evaluating the distribution, droplet size, and coverage of conventional aerial spray applications employ white cards for use with a formulation which has been strongly colored with an oilsoluble dye (Isler 1963), or cards coated with an oil-sensitive dye for use with conventional undyed formulations (White 1959). As it is uneconomical, undesirable, and inconvenient to dye formulations, except for special limited tests, the use of the white spray cards is inapplicable for normal field conditions. Small droplets leave such small end transient marks on the oil-sensitive dyed card that these are also inapplicable. The herein-described technique was developed to evaluate low-volume aerial spraying patterns of malathion under normal field conditions.

Document Type: Research Article

Publication date: December 1, 1965

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  • 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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