Effects of Boom Winglets and Droplet Size on Insecticide Deposition on Cotton

J. E. Mulrooney and K. D. Howard


Experiments were conducted to measure the amount of bifenthrin deposited on cotton when applied by aircraft using micronairs, a conventional spray boom, and a boom with airfoil winglets. The micronairs were adjusted to produce small (100-150 µm) and large (500-600 µm) droplets. Bifenthrin residues were removed from the terminal, fruiting branches, and main stem sections in the upper part of the cotton plant. Residues were quantified by gas chromatography. Deposition was higher when large droplets were used. The fruiting branch at the fourth node from the top of the plant received a greater amount of insecticide than the other fruiting branches and main stem sections. There was no significant difference in deposition between the conventional boom and the boom with winglets.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pp. 1123 - 1125
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998