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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #109563
Title: YELLOW NUTSEDGE (CYPERUS ESCULENTUS) AND PURPLE NUTSEDGE (CYPERUS ROTUNDUS)MANAGEMENT WITH GLYPHOSATE/MSMA COMBINATIONS.

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

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 3/1/2000
Publication Date: 10/1/2000
Citation: Culpepper, A.S., York, A.C., Webster, T.M. 2000. Yellow nutsedge (Cyperus esculentus) and purple nutsedge (Cyperus rotundus) management with glyphosate/MSMA combinations [abstract]. Proceedings of Southern Weed Science Society. 53:57-58.

Interpretive Summary:

Technical Abstract: Nutsedge is among the most troublesome and common weeds of cotton in the Southeast. Roundup Ready cotton has allowed for effective early season control of yellow nutsedge, though multiple applications are often needed for season-long control. Field and greenhouse studies were conducted in Georgia and North Carolina to compare nutsedge control by Roundup/MSMA mixtures to each compound applied alone. Treatments were arranged as a factorial of five rates of Roundup (0, 0.25, 0.5, 0.75, and 1.0 lb ai/A) and four rates of MSMA (0, 0.5, 1.0, and 2.0 lb ai/A). Roundup applied at 0.5, 0.75, and 1.0 lb/A controlled purple nutsedge 11 to 16% more effectively than yellow nutsedge. In contrast, MSMA controlled yellow nutsedge 12 to 13% greater than purple nutsedge. Adding MSMA at 0.5 lb/A with Roundup was of little benefit for controlling yellow or purple nutsedge. However, adding MSMA at 1.0 lb/A to Roundup increased yellow nutsedge control at least 9% when control by Roundup alone was less than 82%. Purple nutsedge was less responsive to the addition of MSMA at 1.0 lb/A to Roundup. MSMA at 2.0 lb/A controlled yellow nutsedge 82 to 92% and mixtures of Roundup plus MSMA were no more effective than MSMA applied alone. When purple nutsedge was controlled less than 82% by Roundup alone, adding MSMA at 2.0 lb/A increased control at least 12%. Roundup applied alone did not injure cotton. MSMA injured cotton 5, 12, and 25% when applied at 0.5, 1.0, and 2.0 lb/A, respectively. Roundup/MSMA tank mixtures tended to be more effective than either herbicide applied alone when nutsedge was controlled less than 82%.