Quick Facts on glyphosate resistance:
FACT: Nine American states have glyphosate resistant Canada fleabane.
FACT: In the past, new herbicides have solved most weed resistance issues.
FACT: Currently there are no herbicides with new modes of action being developed for the Ontario market.
FACT: No herbicide has ever been used on as many acres as glyphosate currently is.
Develop a game plan for 2004 and beyond:
Ensuring that current weed control products are not overused is critical for preventing weed shifts and resistance. Invest the time to discuss your weed management strategies with a Certified Crop Adviser (CCA). Together you can develop herbicide and crop rotations as well as tillage practices that address particular weed issues while minimizing selection pressures that cause weed resistance.
If you see unusual weed escapes report them!
Be on the lookout for the following symptoms in your field:
• A weed species that should have been controlled but is healthy while other susceptible species have been controlled.
• Poor control of a susceptible weed when the herbicide was used according to the product label.
Stop a potential problem from getting worse. If you see any weed escapes whereby a good explanation for their lack of control does not exist, report them by calling:
Agricultural Information Contact Centre
Take advantage of this toll-free number. The University of Guelph will test suspicious weed escapes for resistance free of charge. Any information obtained from this service is confidential and will allow weed researchers to develop control options for resistant weed populations.