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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #176408
Title: CONTROLLING TROPICAL SPIDERWORT WITH ROUNDUP READY FLEX SYSTEMS

Author
item FLANDERS, J - UNIVERSITY OF GEORGIA
item CULPEPPER, A - UNIVERSITY OF GEORGIA
item Webster, Theodore
item YORK, A - NC STATE UNIVERSITY

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: 2/10/2005
Publication Date: 7/1/2005
Citation: Flanders, J.T., Culpepper, A.S., Webster, T.M., York, A.C. Controlling Tropical spiderwort with Roundup ready flex systems [abstract]. In: Proceedings of the 2005 Beltwide Cotton Conferences, January 4-7, 2005, New Orleans, Louisiana. p. 2873-2874.

Interpretive Summary:

Technical Abstract: Commercialization of Roundup Ready Flex cotton is anticipated for the 2006 production season. This technology will offer growers a wider application window for applying higher rates of glyphosate over-the-top of cotton. Although more flexibility in a Roundup Ready program will be beneficial, weeds that are difficult to manage with current Roundup Ready programs, such as tropical spiderwort, may be even more problematic. Thus, a study was conducted to evaluate the response of tropical spiderwort to potential Roundup Ready Flex systems. The experiment was conducted during 2004 in Cairo, Georgia in a field naturally infested with tropical spiderwort. Tropical spiderwort was controlled only 52% 17 days after the 13-leaf application by glyphosate applied twice. Metolachlor mixed with glyphosate at the 4-leaf timing improved control >28%. However, metolachlor mixed with glyphosate at the 13-leaf timing did not improve control, as the weed was already five inches (too large to control). Programs including metolachlor applied sequentially were the most effective and controlled spiderwort >90%. Late-season control was 66 to 76% with sequential applications of metolachlor. The only other two programs controlling spiderwort >50% included three applications of glyphosate mixed with metolachlor at either the 7- or 13-leaf application timing.