Submitted to: Horticultural International Congress Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 8/1/2002
Publication Date: 8/1/2002
Citation: HUTCHINSON, P.J., BOYDSTON, R.A., TONKS, D., BEUTLER, B.R. POTATO VARIETY TOLERANCE TO FLUMIOXAZIN AND SULFENTRAZONE IN THE PACIFIC NORTHWEST. XXVITH INTERNATIONAL HORTICULTURAL CONGRESS AND EXHIBITION. ON-SITE PROGRAM P. 117-118. AUG 2002.
Technical Abstract: Weed-free field studies were conducted in 2000 and 2001 to evaluate potato variety tolerance to two new mode-of-action, preemergence herbicides: flumioxazin and sulfentrazone. Russet Burbank, Russet Ranger, Russet Norkotah, and Shepody were tested for tolerance both years at Aberdeen, ID, and in 2001 at Paterson, WA. In 2000 in Idaho, visual injury ranged from 5 to 25%, depending on herbicide treatment. Both sulfentrazone rates resulted in plant height reduction of Russet Burbank and Russet Norkotah. In 2001, at Idaho, flumioxazin or sulfentrazone applied at both rates resulted in visual crop injury. As in 2000, Russet Burbank plant height was reduced in all herbicide treated plots. Russet Burbank and Bannock Russet were most affected by the 2X rates of either herbicide. In Washington 2001, sulfentrazone injury to Ranger Russet and Shepody was greater than injury to other varieties. Flumioxazin 1.3X injured Ranger Russet more than three other varieties. In Idaho, 2000, initial visual injury and plant height reduction did not translate to significant tuber yield loss. In Idaho 2001, all herbicide treatments resulted in reduced tuber yields compared to the untreated controls. At Washington in 2001, Ranger Russet tuber yields were reduced by sulfentrazone 2.6X and flumioxazin 1.3X compared to untreated control yields. Sulfentrazone 2.6X also reduced Shepody tuber yields compared to the untreated control.