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POST Weed Control Using Halosulfuron in Direct-Seeded Watermelon

Published online by Cambridge University Press:  20 January 2017

James W. Shrefler*
Affiliation:
Wes Watkins Agricultural Research and Extension Center, Box 128, Lane, OK 74555-0128
Lynn P. Brandenberger
Affiliation:
Department of Horticulture and Landscape Architecture, Oklahoma State University, 360 Ag Hall, Stillwater, OK 74078-6027
Charles L. Webber III
Affiliation:
Department of Horticulture and Landscape Architecture, Oklahoma State University, 360 Ag Hall, Stillwater, OK 74078-6027
Warren Roberts
Affiliation:
USDA, Agricultural Research Service South Central Agricultural Research Laboratory, P.O. Box 159, Lane, OK 74555
Mark E. Payton
Affiliation:
Department of Horticulture and Landscape Architecture, Oklahoma State University, Wes Watkins Agricultural Research and Extension Center, Box 128, Lane, OK 74555-0128
Lynda K. Wells
Affiliation:
Statistics, Oklahoma State University, 301 Math Sci., Stillwater, OK 74078
*
Corresponding author's E-mail: jim.shrefler@okstate.edu

Abstract

Watermelon growers rotate crops to prevent problems, but weed populations in new fields may hold unexpected control challenges. Having effective POST herbicides would provide growers an opportunity to respond to emerging weeds on an as-needed basis. To address this need, field studies were conducted over 4 yr in Oklahoma to determine efficacy and crop response of POST halosulfuron applications to direct-seeded watermelon that received PRE application of ethalfluralin at 840 g/ha. At 5 wk after crop emergence (WAE) halosulfuron was applied at 18, 27, 36, and 54 g/ha. The 27 g/ha rate was also applied at 1, 2, 3 and 7 WAE. Halosulfuron applications made 5 WAE did not provide acceptable (> 80%) control of pigweeds and cutleaf groundcherry regardless of rate. Applications made 1 WAE provided significantly better control of pigweeds and cutleaf groundcherry than did later applications. Halosulfuron treatments of 36 and 54 g/ha made 5 WAE and of 27 g/ha made 1, 2 and 3 WAE did not result in significant yield increases compared with the hand-weeded check. These studies show that POST halosulfuron application may be a useful treatment for direct-seeded watermelon. This option would enable more judicious use of herbicides and possible reduction in production costs.

Information

Type
Research
Copyright
Copyright © Weed Science Society of America 

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