Defoliation Tests with Ginstar at the Maricopa Agricultural Center in 1996
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AbstractDefoliation tests were conducted on Upland and Pima cotton at the Maricopa Agricultural Center to evaluate rates of Ginstar, tank mixes of Ginstar with other defoliants and spray adjvants, and Ginstar used as a preconditioner. The cotton used in these tests was generally difficult to defoliate, probably because of an excessive supply of nitrogen and cool temperatures in October and November. In September tests, no treatment gave acceptable defoliation of Upland cotton and only the highest rate of Ginstar and the Ginstar + Def treatment were effective on Pima cotton. In October and November tests, temperatures were cool and Upland cotton was not consistently defoliated by a single application of defoliant. Pima cotton was effectively defoliated by Ginstar treatments in early October and November tests. Under cool weather conditions when defoliation was very difficult, Ginstar used as a preconditioner at .047 lb. a. i./acre followed by Ginstar at .094 lb. a. i./acre generally gave acceptable defoliation.