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Title: Response of Ranger Russet potato to simulated glyphosate drift

item FELIX, JOEL - Oregon State University
item Boydston, Rick
item HUTCHINSON, PAM - University Of Idaho
item BURKE, IAN - Washington State University

Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/1/2009
Publication Date: 2/8/2010
Citation: Felix, J., R. Boydston, P. Hutchinson, I. Burke. 2010. Response of Ranger Russet potato to simulated glyphosate drift. Combined meeting of the Society for Range Management and Weed Science Society of America, Denver, CO. 2010. Paper #O-42. 2010.

Interpretive Summary:

Technical Abstract: Field studies were conducted in 2008 at Ontario, OR, Paterson, WA, and Aberdeen, ID to determine the effect of simulated glyphosate drift on potato. Glyphosate was applied at 10-15cm height, stolon-hooking, tuber-initiation, and bulking stage. Glyphosate was applied at 0, 8.5, 54, 107, 215, and 423g ae/ha at each timing. Leaf disc samples for quantifying shikimic acid accumulation were collected 7 days after each application (DAT). Injury symptoms were characterized by chlorosis of new leaves and were greatest for rates = 107 g ae/ha and when applied at the hooking and tuber initiation stages. Evaluations at 42 DAT indicated 0, 7.5, 33.8, 56.9, and 82.5% injury for the hooking application timing with 0.01, 0.06, 0.13, 0.25, and 0.5g ae/ha, respectively. The corresponding injury for plants sprayed at the tuber-initiation stage was 1.3, 5, 14.4, 35.6, and 55.6% for the respective rates. The greatest US#1 potato yield reductions at Ontario were from the hooking and tuber initiation timings with 46 and 48%, 47 and 82%, and 79 and 81% for glyphosate applied at 0.13, 0.25, and 0.50 g ae/ha, respectively. The corresponding yield reduction at Paterson was 84 and 77%, 97 and 83%, and 92 and 94%, for respective timing and rates. At Ontario, shikimic acid accumulation increased with application rates and ranged from 2.6-56.6, 2.5-92.5, 1.2-44.1, and 2-54.4 mg/10 leaf discs for the application timings of 10-15cm, hooking, tuber-initiation, and bulking stages. Corresponding accumulations at Paterson were 4.2-69.9, 0.3-66.2, 1.6-21.1, and 1.7-8.4 mg/10 leaf discs, for respective timings.