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Roundup Ready™ Gene in Cotton

Eric M. Johnson


Since the mid-1980's, Monsanto Company has been developing the Roundup ReadyTM gene to confer crop tolerance to Roundup Ultra® herbicide in multiple crops including cotton. Cotton plants with the Roundup ReadyTM gene have the EPSPS gene from Agrobacterium spp. strain CP4. This gene produces an EPSPS synthase which is not sensitive to Roundup Ultra®. Cotton plants containing this gene are therefore tolerant to over the top or post directed applications of Roundup Ultra® while weeds remain sensitive and will be controlled by the herbicide.

Roundup ReadyTM cotton is tolerant to topical applications of Roundup Ultra® from ground crack through the 4 leaf stage of development. Post directed techniques may be used to apply Roundup Ultra® in Roundup ReadyTM cotton which is 5 leaves or larger. The maximum rate of Roundup Ultra® which may be used in early season topical or post directed applications is 0.75 lbs ae/A and multiple applications may be made. Roundup Ultra® herbicide may also be applied topically to cotton after it has reached 20% boll crack.

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pg. 51
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998