Browse resources Displaying 1 - 1 of 1 resources Credit Lynn Ketchum (Cropped from original) As Russian thistle becomes resistant to glyphosate, OSU Extension weed scientist finds alternatives for wheat farmers Russian thistle thrives in the dry climate of eastern Oregon and Washington and if left unchecked develops an extensive root system that competes with wheat for water and nutrients. Kym Pokorny | Nov 2, 2021 | News story