What is in this article?:
- Temik decision shortens response time
- Product availability is limited
- Resistance may be best bet for nematode control in cotton
He says a combination of products may help growers manage nematode pressure. Seed-applied nematicides, along with products such as Vydate may be helpful. Vydate has been used in the past, as a secondary treatment after Temik runs out. “Temik was always more consistent than other products and was always the cheaper option. But with higher cotton prices, combinations might be feasible.”
He says Telone can be a viable option. “Terry Wheeler and I have evaluated Telone on the Texas High Plains and found that it is efficient. We don’t have as much information on Vapam or K-pam at this time.”
He says they are also looking at variable rate application of Telone to reduce overall costs. “We’re starting research this year. Researchers have evaluated variable rate application of Telone in the Mid-South and the Southeast, developed management zones and treated them accordingly. Distribution of nematodes in the field may be different here, so we are conducting our own trials.”
He recommends that cotton farmers who use Telone leave untreated strips in the fields to evaluate efficacy.
“Also, be skeptical of new chemistry claims. Cotton is big business and pest control in cotton is big business with a lot of money to be made or lost. If something sounds too good to be true, it probably is.
“If something was comparable with Temik it would have been on the market already. Temik was around a long time. That’s why it was so economical.”
Woodward says few Texas growers use Temik in peanuts. “They use some off the Caprock and in South Texas and the Rolling Plains. In those areas, crop rotation is a good option.” He says in fields with both the Southern root-knot nematode and the peanut root-knot nematode control decisions will be more difficult.
Finally, Woodward says farmers need to maximize growing conditions for cotton and reduce stress factors as much as possible. He says providing adequate moisture and fertility, along with timely planting helps maintain good plant health and lessens nematode damage.
“Anything that sets the crop back may increase nematode injury. It’s important to get plants to square as quickly as possible.”
Woodward says historically nematodes have been the worst problem for High Plains cotton farmers. “Recently, however, Verticillium wilt has become the worst problem. I expect nematodes to regain the crown within the next few years unless we make significant advancements, which is very unlikely.”
As with nematodes, variety selection is the first line of defense for Veticillium wilt and Fusarium wilt. “But farmers have to know which wilt they have to select the proper variety. Then, they can develop a management strategy.”
He says Verticillium is more widespread. No effective fungicide is available for either wilt but “we’ve seen some promising options in the lab for Fusarium.”
Crop rotation is a good option for wilt control. “But our options are limited,” Woodward says. “If farmers can initiate a grain rotation prior to the onset of a wilt problem they can see more benefit than if the field already has serious infestations. With a severe wilt problem, farmers will need multiple years of grain production to see a benefit.”