Weed Scientists at Purdue and Ohio State have collaborated on a number of research and extension projects related to glyphosate-resistant horseweed. Understanding the geographical distribution of this weed in Indiana and Ohio is a major goal of Weed Scientists at both institutions.

Glyphosate resistant horseweed has been identified in at least one field in the counties marked with solid orange. A few fields contain horseweed populations resistant to glyphosate and either chlorimuron or cloransulam - these counties are indicated with the crosshatch pattern. For more information about Indiana click here. For more information about Ohio populations, contact Jeff Stachler or Mark Loux with specific questions.

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Purdue University Home Page

For more information regarding this web page please contact:

Vince Davis, Valerie Mock, Bill Johnson, or Glenn Nice.