Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 1/30/1995
Publication Date: N/A
Technical Abstract: Herbicide-resistant sugarbeet varieties have the potential for solving rotation restrictions due to long residual herbicide carryover from the previous year as well as broadening the weed control opportunities in sugarbeet. The sulfonylurea resistant sugarbeetlines, EL 49 and 5-181, were evaluated for cross resistance to the triazolopyrimidine sulfonanilide herbicide, flumetsulam, and the imidazolinone herbicide, imazamethabenz, i tissue culture, greenhouse studies, and ALS enzyme essays. EL 49 was at least 30-fold more tolerant than sensitive sugarbeet to flumetsulam and about 10-fold more tolerant to imazamethabenz. A sister line of EL 49, name 5-181, showed cross resistance to flumetsulam but not to imazamethabenz. EL 49 and 5-181 exhibited a greater than 20-fold level of resistance in ALS assays versus sensitive controls to flumetsulam but less than 3-fold resistance to imazamethabenz. These results indicate a second genetic factor for herbicide cross resistance in present EL 49.