Law of Overlapping Residuals
March 1, 2012 In the fight against resistance, weed scientists recommend that residual herbicides be used in overlapping intervals. By the time one residual is playing out, another is ready to take over. It continues through the season.
To supply the necessary residual tools, MANA stepped up.
“In our portfolio are a series of products that fit those recommendations,” says Dave Downing, MANA’s senior product manager—herbicides. “Most of these residual herbicides will give you 2-1/2 to 3 weeks of activity. The theory of overlapping residuals is that you should be putting down another residual at about 2-1/2 weeks. You don’t risk that gap in there, even though most of these will hold for around 3 weeks.”
Not only are you getting better control by throwing the playbook at resistant weeds, you’re also getting rotating modes-of-action to lessen the chance a target weed will develop resistance.
“In our portfolio we have Cotton Pro, Cotoran, Direx, Pyrimax and Triflurex, and they are the five that we recommend for residual weed management under this regimen,” says Downing.
Over the years as patents expired, what was Karmex became simply the generic compound diuron. When MANA joined the fray, what had become diuron then became Direx 4L. In addition, the Karmex name was revived.
“Last April, we purchased the franchise of diuron from DuPont. So we became, in essence, not the sole source of diuron in the U.S., but by far the primary source for Direx and Karmex,” says Downing. “What we have essentially done is get rid of the diuron name, and are replacing it with the original manufacturer’s name.”
Karmex is the dry formulation of diuron, while Direx is the liquid formulation. In cotton, Direx will be the predominant product.
In the MANA insecticide portfolio are the abamectin product ABBA Ultra, and the pyrethroid product Paradigm.
“Both of these, we think, are reliable standards in the market,” Downing says. “We have new formulations that give great performance.”
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