What is in this article?:
- Controlling cotton insects early can pay dividends
- Adding pyrethroid boosts effectiveness
- No changes in insect susceptibility to Bt
Controlling cotton insects early, particularly plant bugs, can pay, says Angus Catchot, Mississippi State University associate Extension professor of entomology and plant pathology, who spoke at the annual Delta Ag Expo at Cleveland, Miss.
No changes in insect susceptibility to Bt
Last year, he says, there were more instances of worm breakthroughs in Bollgard II and Widestrike cotton.
“We saw a very extended period of moths in traps, and high numbers, and we had questions from growers as to whether the technology was working.
“While we’re aware of grower concerns, none of the data to date have shown any changes in the insects compared to previous years in terms of susceptibility to the Bt toxins. Rather, the difference has been the result of increased and sustained worm pressure. We’re continuing to evaluate the situation.”
A new insecticide from Dow, Transform WG, has been evaluated in trials the last three years, Catchot says, and application has been made to the Environmental Protection Agency for a Section 18 permit for 2011. If approved, its availability is expected to be limited.
“Last year, under very heavy plant bug pressure, this product looked as good as the best materials now available, and in some cases better. It also has very good activity on cotton aphids, so when it becomes available, we’ll have another good product for both plant bugs and aphids.”
We have also been testing Belay, a new Valent neonicotinoid product, which has also performed well in our testing program, he says.