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Cotton Pesticide Deposition from Aerial Electrostatic Charged Sprays

J.B. Carlton, I.W. Kirk, M.A. Latheef


A 1995 season-long aerial electrostatic spray charging program was undertaken to determine the feasibility of controlling whitefly in cotton. Sixty acres of whitefly infested production cotton was made available for the study by the University of Arizona, Maricopa Agricultural Center at Maricopa, AZ. This test area was subdivided into four equal size replicates which were further subdivided into four aerial spray treatment plots. In the four spray treatments formed, we sought to compare three spray charging regimens with that of conventional aerial spraying for whitefly. The season-long control effort consisted of six aerial pesticide applications over the test plots. Intensive pre and post spray sampling of depositing spray was carried out by use of leaf washers. The spray dosage resulting from quantitative analysis of the leaf deposits provided a basis for statistical inference. The large-scale experimental study resulted in many detailed conclusions. However, relative to our objectives, we found some important results. From an overall season perspective, one of the three aerial electrostatic spray charging protocols gave cotton deposition levels that were equal to or significantly higher than that of the conventional protocol applying the same active ingredients. A companion study that dealt with efficacy, referenced in the text, also drew some positive conclusions regarding whitefly control using aerial electrostatic spray charging technology.

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 1036 - 1040
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998