Notes:
How do you know if you have a herbicide resistance problem? Herbicide resistance should only be suspected when 1) other causes of herbicide failure have been ruled out; 2) the same herbicide or herbicides with the same mode of action have been used year after year; 3) one weed that is normally controlled is not controlled while other weeds are; 4) healthy weeds are mixed with controlled weeds (same species); and 5) a patch of uncontrolled weeds is spreading. Herbicide resistance should be confirmed by collecting seed from a suspect plant and subjecting the plants grown from this seed to various rates of the suspect herbicide(s) by your local extension or research specialist.

Herbicide Resistance Should Only Be Suspected When ....<BR> other causes of herbicide failure have been ruled out. <BR> the same herbicide or herbicides with the same mode of action have been used year after year. <BR> one weed that is normally controlled is not controlled while other weeds are. <BR> healthy weeds are mixed with controlled weeds (same species) <BR> a patch of uncontrolled weed is spreading. <BR>