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- Title
Response of an acetolactate synthase (ALS)-resistant biotype of Amaranthus rudis to selected ALS-inhibiting and alternative herbicides.
- Authors
Sprague, C. L.; Stoller, E. W.; Wax, L. M.
- Abstract
An Amaranthus rudis Saner (common water-hemp) biotype from a field treated for two consecutive years with a mixture of chlorimuron and metribuzin was tested in greenhouse and laboratory studies to assess resistance and cross-resistance !o four acetolactate synthase (ALS)-inhibiting herbicides. The biotype demonstrated »1920-fold resistance at the whole plant level, and »850-fold resistance al the ALS enzyme to chlorimuron, compared with a susceptible biotype. This chlorimuron-resistant biotype was also cross-resistant to primisulfuron, halosulfuron and imazethapyr. In greenhouse studies, atrazine alone or in combination with ALS-inhibiting herbicides provided excellent control of the resistant biotype of A. rudis. Combinations of dicamba and ALS-inhibitors also provided adequate control. Additionally, premixtures of flumetsulam and metolachlor and of dicamba and atrazine furnished excellent control of this chlorimuron-resistant A. rudis biotype.
- Subjects
ACETOLACTATE synthase; METRIBUZIN; HERBICIDE resistance; PLANT fibers; HERBICIDES; WEED control; EFFECT of atrazine on plants
- Publication
Weed Research, 1997, Vol 37, Issue 2, p93
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1046/j.1365-3180.1996.d01-3.x