Defoliation Tests with Ginstar at the Maricopa Agricultural Center in 1997

Defoliation 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 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 early October, only the Ginstar + Def treatment gave good defoliation of upland while all treatments gave good defoliation of Pima cotton. In late October tests, temperatures were cool and only Ginstar + Def and Ginstar followed by Ginstar treatments gave effective defoliation in 14 days. In October and November tests, Ginstar used as a preconditioner was effective in helping to defoliate cotton under, cool weather conditions.