Purdue, Ohio State partner to help farmers control marestail
A marestail weed regrows after glyphosate application. Marestail, or horseweed, has become increasingly problematic for Indiana and Ohio soybean growers because it is resistant to common herbicides. Purdue Weed Science photo/Bill Johnson
Purdue and Ohio State University Extension have partnered to publish a new fact sheet aimed at helping farmers battle herbicide-resistant marestail and its yield-reducing effects on soybeans. Marestail, also referred to as horseweed, primarily emerges in late summer into fall and again from late-March through June in both Indiana and Ohio.