There are already reports of a glyphosate-resistant ryegrass in Australia and Canada and goosegrass in Malaysia. Sporadic but unproven claims of other Roundup-resistant weeds also are being closely studied. We strongly urge that they take a conservative approach to the Roundup technology and not use it every year. He adds that Ohio State University hasn't come out with recommendations for frequency of Roundup use. However, OSU suggests you use ALS herbicides as your primary weed control only once every four years to prevent weed resistance.
Weeds have a very long memory when it comes to what herbicides do.
And nature will find a way around them. Click here . We'd like to hear from you. Your message will be posted to our bulletin board. First published October 2000.