CROP TOLERANCE AND WEED CONTROL WITH FLUMIOXAZIN AND SULFENTRAZONE IN PACIFIC NORTHWEST POTATO PRODUCTION

Authors: Boydston, Rick; RANSOM, COREY - OREGON STATE UNIVERSITY; HUTCHINSON, P - UNIVERSITY OF IDAHO

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/2001
Publication Date: 8/1/2001
Citation: BOYDSTON, R.A., RANSOM, C.V., HUTCHINSON, P.J. CROP TOLERANCE AND WEED CONTROL WITH FLUMIOXAZIN AND SULFENTRAZONE IN PACIFIC NORTHWEST POTATO PRODUCTION. AMERICAN JOURNAL OF POTATO RESEARCH, Abstract 78:445. 2001.

Interpretive Summary:

Technical Abstract: Sulfentrazone and flumioxazin were tested for weed control in potatoes near Aberdeen, ID, Ontario, OR, and Paterson, WA. Herbicides were applied after the final hilling and preemergence to potato and weeds. Flumioxazin applied at 0.05 to 0.13 lb/a controlled hairy nightshade and common lambsquarters well, but redroot pigweed control was marginal in Idaho and Oregon. Redroot pigweed control improved as flumioxazin rate increased in Oregon. Flumioxazin did not control tame oats, barnyardgrass, or large crabgrass. Little or no potato injury was observed when treating with flumioxazin in Idaho and Oregon, but flumioxazin slightly injured potatoes when applied at 0.13 lb/a in Washington. Sulfentrazone applied at 0.06 to 0.25 lb/a controlled common lambsquarters, redroot pigweed, and hairy nightshade greater than 90% at all locations. Fulfentrazone controlled barnyardgrass greater than 90% at 0.19 and 0.25 lb/a in Oregon. Tame oats and large crabgrass were not controlled by sulfentrazone. Sulfentrazone visually injured potatoes at 0.19 lb/a or more in Oregon and Washington, but potato tuber yield was not reduced compared to potatoes treated with herbicide standards. Tank mixes of sulfentrazone or flumioxazin with standard preemergence applied herbicides improved control of annual grass weeds and redroot pigweed.