The situation may be even more critical in peanuts.

“Without Temik we may be in a world of hurt,” said John Damicone, Oklahoma State University Extension plant pathologist, at a recent peanut field day at the Caddo Research Station in Fort Cobb. “We really don’t have another nematicide for peanuts.”

Damicone said farmers in Caddo County, a major peanut producing county, “rotate well. But they still use Temik on most of the acreage to control Northern Rootknot nematode.”

He said Vydate might help but that several other nematicides once available “have been pulled. And now Temik will be gone.”

The best option, he said, will be rotation, particularly with cotton.”With two years out of peanuts and one in we shouldn’t have to treat for nematodes,” Damicone said. “Three years out of peanuts would be better but farmers should stay out for two years at a minimum.”

Plant resistance likely will improve. Several cotton and two peanut varieties currently have nematode resistance but need tweaking. “The resistant cotton varieties are too loose for West Texas,” Wheeler says. “We need research into resistant varieties that are adapted to this area.”

COAN and NemaTAM (both Texas A&M peanut varieties) are resistant to some nematodes but not the Northern Rootknot that troubles Oklahoma and some New Mexico growers. “We don’t have resistance for those,” she said. “But for peanut and javanica nematodes we have pretty good resistance.”

Damicone said Oklahoma peanut farmers had “pretty good resistance to the Northern Rootknot nematode at one time. But with variety crosses we lost that resistance. We have potential to breed for nematode resistance. In the meantime, losing Temik will be a problem.”

Wheeler says Temik has been a highly effective in-furrow treatment for nematode control because it reduces the first generation of nematodes. “That’s the most important generation.”