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Consultant Perspectives on Weed Management Needs in Arkansas Rice

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy ,
Nilda R. Burgos ,
Robert C. Scott  and
Kenneth L. Smith
Jason K. Norsworthy*
Affiliation:
University of Arkansas, Department of Crop Soils and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
Nilda R. Burgos
Affiliation:
University of Arkansas, Department of Crop Soils and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
Robert C. Scott
Affiliation:
University of Arkansas, Department of Crop Soils and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
Kenneth L. Smith
Affiliation:
University of Arkansas, Department of Crop Soils and Environmental Sciences, 1366 West Altheimer Drive, Fayetteville, AR 72704
*
Corresponding author's E-mail: jnorswor@uark.edu
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Abstract

Certified Crop Advisors of Arkansas and members of the Arkansas Crop Consultants Association were surveyed in Fall 2006 through direct mail to assess current weed management practices and needs in rice from both a research and educational perspective. Consultants reported scouting 228.2 of the possible 567 thousand hectares (40%) of rice grown in Arkansas. Pre-emergence herbicides most often recommended were clomazone (93%) and quinclorac (40%). Propanil (55%) and quinclorac (47%) were the two most commonly recommended postemergence herbicides. Thirty-two percent of the consultants often recommend three or more herbicide applications per field. An average of 37% of the fields were believed to have “serious” or “very serious” weed infestations, and fields were scouted for weeds on average 11 times per growing season. Ninety-two percent of the consultants had “moderate” to “high” concerns with herbicide-resistant weeds. The perceived average additional expense associated with managing a resistant weed in rice was $65.60/ha. Propanil-resistant and quinclorac-resistant barnyardgrass were believed to be infesting 24 and 7% of the scouted rice hectares, respectively. Barnyardgrass was the most problematic weed of rice followed by red rice. Northern jointvetch and smartweeds were the two most problematic broadleaf weeds. The number one research need was improved broadleaf weed control. Respondents indicated that research and educational efforts should continue to focus on herbicide performance and development of economical weed control programs.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGnorthern jointvetch, Aeschynomene virginica (L.) B.S.P. AESVIred rice, Oryza sativa L. ORYSAsmartweeds, Polygonum spprice, Oryza sativa L.Weed management survey
Type
Extention/Outreach
Information
Weed Technology , Volume 21 , Issue 3 , September 2007 , pp. 832 - 839
Copyright
Copyright © Weed Science Society of America 

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