Controlling herbicide-resistant pigweed
Size matters when it comes to controlling herbicide-resistant pigweed, said Robert Goodson, Phillips County Extension agent with the University of Arkansas Division of Agriculture.
"If we have a weed that is 2 inches tall, we usually get pretty good control," he said. "If we have a weed that's 6 inches tall, we usually lose control.
"So it's very important, whether using Roundup Ready or the Liberty Link crop technologies, to control weeds when they are extremely small," Goodson said. "That way we have a whole lot more success in controlling this noxious weed."
Due to spring flood delays, "many of our beans are late and we still have the option to make an over-the-top application for Palmer pigweed control," he said.
The herbicide of choice will depend on what technology in the field.
"If you have Roundup Ready soybeans you would end up using up to 24 ounces of fomesafen in the field," Goodson said. "If you have Liberty Link beans, the herbicide of choice will be Ignite.
"You can use up to 57 ounces of Ignite, but the accepted application rate will be two 22-ounce applications instead of one big one," he said. "We seem to have better control with two smaller applications overall."
For more information, contact your county Extension agent.