Source:  CORN AND SOYBEAN DIGEST, 7/19/11
 
In the past week Iowa State University Extension received numerous calls from farmers, agricultural chemical dealers and industry representatives regarding waterhemp and horseweed/marestail surviving glyphosate applications made in late June and early July. Although there are numerous reasons why a herbicide application might fail at controlling weeds, ISU Extension agents are certain that a significant percentage of these failures are due to the presence of glyphosate-resistant biotypes in the field.

For more of this story, click here.