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Evaluation of Triclopyr as a Potential Harvest Aid

Robert G. Lemon, Mark L. McFarland, D. Joel Pigg, Archie Abrameit, J. Tom Cothren and T. K. Witten


 
ABSTRACT

Due to the annual problems with cotton regrowth in Central Texas, and the rapid acceptance of Roundup Ready cotton, a study was implemented to assess activity of triclopyr as a potential harvest aid. Def + Dropp tank mixes containing Remedy and Grandstand exhibited poor defoliation and considerable plant desiccation at two locations on non-Roundup Ready cotton varieties (Suregrow 125 and DP&L 33B). The Grandstand and Remedy treatments demonstrated unacceptable leaf desiccation and defoliation at all rates. Symptomology was very similar to paraquat, and complete leaf desiccation occurred within three DAT. At the College Station location, terminal and basal regrowth were present in all treatments that did not contain triclopyr. The Remedy and Grandstand treatments showed no terminal regrowth and only negligible basal regrowth at 21 DAT. At the Thrall location, no statistical differences were observed for terminal and basal regrowth. At the Thrall location with DP&L 436 RR, Def + Dropp + Remedy tank mixes exhibited poor defoliation and significant leaf desiccation at all three rates. However, the Def+Dropp +Grandstand tank mixes exhibited excellent defoliation and no plant desiccation. At this location, a differential response between the ester and salt formulations of triclopyr was evident. Terminal and basal regrowth data analysis indicated no statistical differences among treatments.



Reprinted from Proceedings of the 2000 Beltwide Cotton Conferences pp. 667 - 669
©National Cotton Council, Memphis TN

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Document last modified Saturday, Jun 17 2000