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Cotton Stalk Termination to Prevent Regrowth

Robert G. Lemon, D. Joel Pigg, Archie Abrameit, W.C. Robertson, J. Tom Cothren, and Ty Witten

ABSTRACT

Studies were conducted in central Texas and Arkansas in 2002 to evaluate 2,4-D (ester and salt formulations), Clarity (dicamba), and Harmony Extra for effectiveness in post-harvest cotton stalk destruction. Treatments included 2,4-D ester and amine formulations (1.0 and 1.5 lbs. a.i./acre – 32 and 48 oz. product), Clarity (0.5 lbs. a.i./acre – 16 oz. product), and Harmony Extra (0.028 lbs. a.i./acre – 0.6 oz. product) applied at shredding, and one, three, and five days post-shredding. The Texas location included an additional application timing of 21 days post-shredding. At both locations, herbicide application timing following shredding (0, 1, 3, and 5 days post-shredding) did not affect regrowth control. Similarly, at the Texas location root mortality also was not affected by herbicide application timing, except in the 21 days post-shredding treatment. Also, at both locations, the 2,4-D ester and amine formulations applied at 1.5 lbs. a.i./acre provided the best overall performance. Clarity and Harmony Extra showed the least regrowth control at both locations. Regardless of regrowth/root mortality ratings, all treatments rendered cotton non-hostable at both locations. Due to liability issues associated with ester formulations, 2,4-D amine (1.5 lbs. a.i../acre) appears to be the best choice for chemical stalk destruction. Due to significant environmental influences, additional research is necessary to develop standard recommendations.





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Document last modified 04/27/04