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Analysis of Spray Deposits on Cards Dyed with Sudan Black BR: Their Preparation and Use1,2

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Cards of Kromekote┬« paper dyed with du Pont Oil Red dye commonly used in the past for field assessment of air-borne spray deposits have not been satisfactory for the more critical analysis required for ultra-Iow-volume (ULV) spraying techniques. A Kromekote paper dyed with Sudan Black BR gave good definition of droplets of malathion as small as 15  in diameter produced by ULV spray. The contrast between the spots and the surrounding surface was increased by limited exposure to sunlight or infrared heat lamps. The preparation of these cards and the relationship of the spot sizes to the true drop sizes is described, and a table of spread factors is presented.

Document Type: Research Article

Publication date: February 1, 1968

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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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