Marestail, or horseweed, has been confirmed to be resistant to glyphosate in California. Have you read your glyphosate herbicide label lately? Today’s glyphosate herbicide is not the same as it was when first introduced as Roundup by Monsanto more than 35 years ago. Generic glyphosate is made in many countries around the world, and, as a result, formulations and inert ingredients vary and rates have changed. “A lot of the problems in the field with glyphosate are not from the herbicide itself but from the rates and application,” said Don Waddle, certified crop consultant for Bleyhl Farm Service in Grandview, […]