Water-sensitive papers (WSP) were placed on top of 20-cm stakes above the crop canopy to monitor the deposition of aerially applied deltamethrin and permethrin. A residue analysis method with 97% mean recovery was developed to determine amounts of insecticide on the WSP. Over four applications, the mean deposition on the WSP was 59- 75% of applied insecticide. The WSP had 91% trapping efficiency for the spray droplets and gave excellent images for visual assessment of the spray deposits. Droplets per square centimeter were a good indicator of the relative amount of insecticide deposited between two formulation treatments. Comparing droplets per square centimeter on horizontal WSP with vertical WSP gave an estimate of the mean angle of incidence of the spray droplets. Droplet size spectra were obtained from manual measurement of the WSP images, but such size determinations were subject to several sources of error. The use of WSP to monitor spray deposition in aerially applied insecticide trials is recommended.
Document Type: Research Article
Publication date: June 1, 1989
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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.