White Bean Sensitivity to Preemergence Herbicides

Abstract

White bean producers have a limited number of herbicide options available for annual grass and broadleaf weed control. Tolerance of two white bean cultivars to preemergence (PRE) applications of S -metolachlor, S -metolachlor + imazethapyr, flumetsulam + S -metolachlor, cloransulam-methyl, clomazone, clomazone + imazethapyr, and clomazone + S -metolachlor at the maximum labeled rate in soybean (1×) and twice the labeled rate (2×) were studied at two Ontario locations (Exeter and Ridgetown) in 2001 and 2002. S -Metolachlor, clomazone, and clomazone + S -metolachlor generally had no negative effect on plant height, dry weight, maturity, and yield. S -Metolachlor + imazethapyr and clomazone + imazethapyr reduced plant height, dry weight, and yield as much as 21, 42, and 24%, respectively. Flumesulam + S -metolachlor and cloransulam-methyl reduced plant height, dry weight, and yield as much as 39, 58, and 43%, respectively. White beans are tolerant to PRE applications of S -metolachlor, clomazone, and clomazone + S -metolachlor. White beans are sensitive to PRE applications of S -metolachlor + imazethapyr, flumetsulam + S -metolachlor, clomazone + imazethapyr, and cloransulam-methyl.