DRY BEAN (PHASEOLUS-VULGARIS) TOLERANCE TO IMAZETHAPYR

A field study was conducted during 3 yr to determine the growth and yi eld response of Pinto, Pink, Red, and Great Northern dry beans to vari ous doses of imazethapyr. Imazethapyr was applied postemergence at 0, 25, 50, 75, 100, 150, and 200 g ha(-1) to each class of dry bean. Resu lts indicated that these four classes of dry beans responded similarly to imazethapyr. Dry bean injury increased and yields were reduced as dose of imazethapyr increased. At the proposed use dose of 50 g ha(-1) imazethapyr reduced yield by 5 to 6%. Imazethapyr at 100 g ha(-1) red uced dry bean yield by 10 to 12% and delayed maturity by 3 to 4 d. Ben efits of superior weed control attained with imazethapyr should be wei ghed against potential crop injury when growers consider using imazeth apyr in their dry bean weed management programs.