Precision of Atomization Estimates for Aerial Sprays1

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The atomization of aerial sprays is commonly expressed in terms of the mass median diameter (mmd) of the spray drops. Most mmd determinations in the past have been made from measurements of all drop sizes collected across the spray swath. Recently, the D-max: method was developed for determining mmd from the largest drops only.

A study was made to determine the precision of these methods under a variety of meteorological conditions. This study showed that as much as ±20% variation from the mean can be expected among mmd estimates made by either method. However, there was a greater central tendency in the grouping of the estimates about the mean when the D-max method was used. None of the variation encountered could be ascribed to meteorological conditions prevailing at the time the tests were conducted. The study indicated that it was largely, or wholly, due to sampling error.

Document Type: Research Article

Publication date: February 1, 1964

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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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