“We also continue to look at Classic because there were always some issues with certain peanut varieties. Over the years, we have not had problems with Florida-07, Georgia Greener or Georgia-07W. However, when we’ve used it on Georgia-06G and Tifguard, we’ve seen a slight yield loss associated with it.”

Drift and sprayer contamination continue to be issues for Georgia peanut producers, says Protsko.

“We’ve been spraying a lot of glyphosate for awhile now, and we’re starting to spray a lot of glufosinate or Liberty, so your probability of having potential problems increases.

“Don’t assume the 2 gallons left in the bottom of the sprayer that looks like water is water. It could be a mixture of something.”

The concern for the future, he says, is what’ll happen to peanuts if growers adopt 2,4-D and dicamba-resistant technology for cotton and soybeans.

“If we know the rate that was used, we can probably figure what the yield loss will be. Most of the problems we’ve seen have been with sprayer contamination.

“If you’ve been spraying cotton and using glufosinate, I encourage you to make sure the tank is clean before spraying peanuts. Peanut yield loss from glufosinate can be fairly significant depending on the time of year.”

While there are no new herbicide products for use on peanuts, researchers are looking at products like Warrant and Fierce to see if they have a potential fit in peanuts, says Protsko.

Growers should continue to be vigilant in avoiding resistance issues with various herbicide classes, he adds.

“Now that about 50 percent of our cotton is being treated with Liberty, we have to manage that herbicide to avoid resistance.

“If you’re a cotton or soybean grower, and you’re anticipating 2,4-D and dicamba-resistant technology, you need to know that those herbicides by themselves are not enough.

“We need glufosinate to help us with pigweed control. If we lose that now before the technology becomes available, we’ll be in trouble.”

Valor and Reflex have the same mode of action, so growers need to use caution when using those herbicides, says Protsko. “Dual and Warrant are in the same herbicide family and have the same mode of action, so we also have to be careful with these materials. Protect these herbicides at all cost.”

phollis@farmpress.com

 

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