Weed tolerance to glyphosate

Weed tolerance to glyphosate

Farm and Ranch June 30, 2010 Washington State University Extension weed scientist Joe Yenish is seeing more tolerance to glyphosate from certain weeds. Yenish talked about it at a recent field day.

Yenish: “Glyphosate in general will still be the basis of the fallow burn down treatments whether they be chem-fallow or set up to the traditional fallow situation. But we are seeing weeds get through the glyphosate applications and probably in the long term future the answer is going to be with additional active ingredients added to the glyphosate either to enhance activity right then or to provide some degree of residual weed control through the fallow to take back some of these more difficult to control weeds. Prickly lettuce is certainly one. In this area we have seen some tumble pigweed get through. There are any number of species that we are seeing shift as a result of the glyphosate uses as a chem-fallow basis.”

When asked about any difference in effectiveness between Roundup and generic glyphosates Yenish said 90 percent of the time there is no difference.

Monsanto recently said it is creating a new product offering that would combine Roundup with complementary chemicals to address glyphosate resistant weeds.

I’m Bob Hoff and that’s the Northwest Farm and Ranch Report on Northwest Aginfo Net.

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