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1 July 2007 Consultant Perspectives on Weed Management Needs in Arkansas Rice
Jason K. Norsworthy, Nilda R. Burgos, Robert C. Scott, Kenneth L. Smith
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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.

Nomenclature: Barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCG, northern jointvetch, Aeschynomene virginica (L.) B.S.P. AESVI, red rice, Oryza sativa L. ORYSA, smartweeds, Polygonum spp, rice, Oryza sativa L

Jason K. Norsworthy, Nilda R. Burgos, Robert C. Scott, and Kenneth L. Smith "Consultant Perspectives on Weed Management Needs in Arkansas Rice," Weed Technology 21(3), 832-839, (1 July 2007).
Received: 14 December 2006; Accepted: 1 April 2007; Published: 1 July 2007

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