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Effects of Roundup Ultra on Roundup ReadyTM Cotton

S. G. Matthews, G. N. Rhodes, Jr., T. C. Mueller and R. M. Hayes


Postemergence weed control is a challenge for cotton producers. Cotton has been developed that is tolerant to the broad spectrum herbicide Roundup Ultra®. The advantages of Roundup ReadyTM cotton include control of a wide range of weed species and favorable environmental profile. The growth stage of cotton determines the application window. Over-the-top treatment is permitted before the fifth true-leaf stage and after 20% open. From the fifth true-leaf stage through 20% open, Roundup Ultra® can be applied only with directed application equipment. Little research has been conducted to determine the extent of injury to the plant from over-the-top and post-directed applications during this interval. Thus, our objective was to investigate the effect of application of Roundup Ultra® during this period.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pg. 850
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998