Submitted to: Washington State Weed Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: August 1, 2001
Publication Date: November 1, 2001
Citation: BOYDSTON, R.A. WEED CONTROL AND POTATO VARIETY TOLERANCE TO TWO NEW POTATO HERBICIDES. PROCEEDINGS OF THE 51ST WASHINGTON STATE WEED CONFERENCE, P. 33-35. 2001. Technical Abstract: Metribuzin herbicide is widely used in potato production but nightshade species are not consistently controlled, metribuzin resistant weed biotypes have increased, and several potato varieties are sensitive to metribuzin. Two new herbicides, flumioxazin and sulfentrazone were tested in 2000 and 2001 for weed control in potato production. These two herbicides controlled dhairy and black nightshade greater than 90% in both years without injury t potato. Tank mixes of flumioxazin and sulfentrazone with common potato herbicides were safe on potato and improved large crabgrass control. In 2001, sulfentrazone applied at double the likely use rate injured Russet Burbank and Shepody varieties more than Ranger and Norkotah. IR-4 residue trials with sulfentrazone and flumioxazin were completed on potatoes in Washington State in 2000 and 2001, respectively. These trials will provide some of the necessary data required by the EPA to register these herbicides sin potatoes.