The dye-tracer method for measuring aerial spray deposits consists of dissolving a known amount of dye in the spray liquid and then measuring the amount of dye recovered in the spray deposit. In forest insect research dye tracers are used for studying the spray distribution from various types of aerial spray equipment and aircraft, and for evaluating spray coverage on small forest plots. At the time of spraying, deposit samples are taken on glass or metal plates. Then, in the laboratory, the deposits are washed of (and the dye in each is measured in a Dubosq® colorimeter or a spectrophotometer. Of the two, the colorimeter is faster but has a lower sensitivity (0.05 gallon per acre). The spectrophotometer procedure, while more complicated, has a sensitivity of 0.02 gallon per acre and in addition will measure each of the 2 dyes in the mixed deposit from the dual-sprayer apparatus.
Document Type: Research Article
Publication date: June 1, 1966
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