Research trials were funded by the Texas Corn Producers Board and the Texas Cotton Producers. The problem began during the drought of 2009 and has continued to escalate, Morgan said.

"The key is to manage the volunteer cotton while it is small and while more herbicides are effective," he said. "If the volunteer cotton is not destroyed early in the season, the cotton plants persist under the corn canopy, then following harvest the cotton plants will flourish and will be an excellent host for the boll weevil."

AgriLife Extension trials were conducted at four locations across the state from the Panhandle region, South Central Texas and South Texas.

Status (5 ounces), Laudis (3 ounces), and Halex GT + Atrazine (58 + 32 ounces) were the only over-the-top products that provided 99 percent control at the one/ two-leaf stage with greater than 1 percent volunteer plants at 65 days after treatment.

"Other products, such as Ignite 280 and Sharpen, were highly effective but must be applied through hoods or post-directed," Morgan said.

At the five-leaf stage, Starane Ultra (6.4 ounces), Status (5 ounces-10 ounces) and 2,4-D Amine (16 ounces) over-the-top provided greater than 90 percent control of volunteer cotton, Morgan said, but none completely prevented volunteer plants, which ranged from 4 percent to 11 percent at 70 days after treatment.