|
Selma, Alabama | The resistance issue is not a new one with Glyphosate, Chemical distributors and university folks have been telling growers (At least here in the south) to manage resistance with multiple modes of action. We had Cockleburs resistant to MSMA, DSMA here way before Roundup was even used in a hooded sprayer, much less sprayed over a crop. Peanut diseases became resistant to Benlate many moons ago. Tobacco Budworms have been resistant to synthetic pyrethroids since 1994 or before.
The real problem on the pigweed (Palmer amaranth) arose when cotton growers began using a low rate of glyphosate (the only herbicide used in the field for multiple years), with no additional surfactant and bred up there own resistant Pigweed. It is documented the less-than labeled-use-rate areas are the hardest hit. Before we all had Roundup Ready crops at our finger tips every cotton grower I know used some type of yellow herbicide (DNAs - Treflan, Prowl, etc.) at the max use rate on new ground and a little less on mono-crop ground. As is always the case, a few folks with bad decision making skills spoil it for the rest of the world. Nothing really new. Resistance management is what it is all about. It doesn't matter if it is herbicides, insecticides, fungicides, or whatever. As one of the chemical companies as says "Dead weeds do not become resistant!" | |
|
Pigweed made the news
