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Many farmers remember when a pound of atrazine herbicide controlled all the weeds in a com field.
Those days are gone. A new group of super weeds, resistant to triazine herbicides, has emerged as the No. 1 pest problem facing farmers. Over the past decade, triazineresistant weeds have spread from com fields throughout the Great Lake and mid-Atlantic states. The broadleaf weeds lambquarters and pigweed are most prevalent but at least one case of triazine-resistant velvetleaf is confirmed in Maryland.
Documented infestations of triazine-resistant weeds cover an estimated 123,500 crop acres in Maryland alone. Resistant lambquarters and/or pigweed also are found in 20 counties of New York and at least 20 counties of Pennsylvania. All counties of Delaware and 41 Virginia counties have recorded triazine-resistant broadleaf weeds.
Triazine-resistant weeds are probably present,- without being documented, on many more farms, says Russ Hahn, Ph.D., Extension weed scientist, Cornell University.
“Farmers must accept the fact that their weed control practices have to change in order to control triazine-resistant weeds,” he says. ) “And once they implement a program that works, farmers must continue using the new program for several years.”
The triazine family includes atrar
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