Know your pigweed species or pay the price

From Southeast Farm Press

Palmer pigweed has a big reputation and most of it gained by being a royal pain in the backside for row crop growers from the Florida Panhandle to the Upper Neck of Virginia.

It may have a bigger reputation for problems in the Lower Southeast, but make no mistake, Palmer amaranth is a problem for row crop production anywhere it lives.

As farmers transition from harvesting this year’s crops to planning next year’s, there is time to re-think basic weed control strategies.

A big part of managing a problem is knowing what the problem entails. North Carolina State Weed Scientist Wes Everman says a good first step for farmers in dealing with Palmer pigweed is to be able to accurately identify it at the seedling stage and to differentiate it from smooth and redroot pigweed species.

Once Palmers get mature, few have any problem with identification. However, in the fall and early spring they are easily confused with redroot and smooth pigweed.

How important is knowing the enemy?

In the case of pigweed, more specifically Palmer amaranth, it can be the difference in being in or out of farming.

University of Georgia Weed Scientist Stanley Culpepper has been at the forefront of battling pigweed in general, but glyphosate resistant pigweed in particular for the better part of 10 years now. He has great respect for his foe.

Management systems for Palmer pigweed are effective but costly. Georgia cotton growers spend more than $100 million per year to manage Palmer amaranth, he says.

That’s just one crop and one state. Glyphosate resistant pigweed is now found in multiple states and in multiple crops in the Southeast.

For the rest of this story, go to Southeast Farm Press.

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