|
|
Cooperative Extension Service |
 |
|
|
|
|
Agricultural
Experiment Station |
|
|
|
|
|
Dale Bumpers College
|
In the News - August 2009
|
|
|
| CHOW TIME - This fall army worm is making quick work of this soybean plant. (Cooperative Extension Service photo by Gus Lorenz) |
|
|
| BOLLWORMS - Bollworms numbers are up this year and aren't limiting their damage to cotton. Curling up into little "C's" when disturbed is a characteristic for identifying bollworms. (Cooperative Extension Service photo by Gus Lorenz) |
LONOKE, Ark. - Three types of caterpillars are defoliating soybeans, cotton and pastureland across millions of acres in Arkansas, according to Gus Lorenz, extension entomologist for the University of Arkansas Division of Agriculture.
"We're seeing activity from three caterpillar-type pests: bollworms, webworms and fall army worms," he said. "The outbreak of garden webworms is the worst I've seen."
Webworms have been chowing down on soybean acreage across the state.
"I've received calls as far north as Joplin, Mo., and the Bootheel, all the way down to south Arkansas and into Louisiana and Mississippi," he said. "It's been pretty destructive to a lot of late-planted beans that didn't need this damage."
Lorenz estimates that some 400,000 to 500,000 Arkansas acres had to be treated with a lot more acreage that didn't receive treatment.
"Millions of acres got hit with them, some worse than others," he said.
In addition to webworms are grass-loving fall army worms.
"It's a pretty good population for this time of year," he said. Rain has added to the woes. Soybean farmers who would normally be treating fields for grass were kept away due to the wet weather. The grass grew and became an inviting environment for the army worms.
"When they sprayed their grass with herbicide, the worms moved off the grass and into the soybeans," Lorenz said. "There are a lot of acres defoliated from fall army worms and now I'm getting calls about army worms in pastures."
Bollworms are a growing threat as well. During the last week of June, the numbers of moths trapped jumped as part of a normal surge. However, the numbers have stayed elevated since - which is abnormal.
"We were averaging 400 to 500 moths per trap every time we checked them," he said.
Moths looking for hosts found only a limited amount of cotton and "a lot of these moths are going to soybeans now. They also causing damage in cotton and milo and tomatoes and everything else," Lorenz said. "They're very versatile pests and feed on a lot of different crops."
The numbers are so high in cotton that growers have to use pesticides in crops specially bred to resist bollworms, such as Bollgard II and Bollgard.
"When we get numbers like we saw towards the front end of July, it overwhelms the technology and we get survivors that we have to spray in order to reduce possible damage caused by the worms," said extension cotton specialist Tom Barber. "This gets frustrating because cotton producers already pay high prices for the technology and they expect it to work flawlessly."
Frustrating may be putting it mildly.
"I just got off the phone with a farmer who's really angry about it," Lorenz said. He added that the insects were affecting his research work for the Division of Agriculture.
"We're kind of like farmers -- we do a lot of plot work and when it's like this, it's about to kill all of us too," he said.
Lorenz said tests in Arkansas found that the bollworm survival rate under pyrethroid treatment jumped from below 10 percent to 48 percent. He believes these worms are survivors of treated fields in south Texas and Mexico. Texas' drought has been conducive to bollworm growth.
"All these insects are pretty cyclical," Lorenz said. "Some years are just worst than others and this is a bad one."
The Cooperative Extension Service is a part of the University of Arkansas Division of Agriculture.
The Arkansas Cooperative Extension Service offers its programs to all eligible persons regardless of race, color, national origin, religion, gender, age, disability, marital or veteran status, or any other legally protected status, and is an Affirmative Action/Equal Opportunity Employer.
August 3, 2009
Media Contact: Elizabeth Fortune
Extension Communications Specialist
U of A Division of Agriculture
Cooperative Extension Service
(501) 671-2120
efortune@uaex.edu
Related Link
Additional Stories:
In the News Archives
August 2009 | September 2009 | October 2009 | November 2009 | December 2009 | January 2010
|
© 2006 |
|
|
University of Arkansas • Division of Agriculture |
Mission
•
Disclaimer
•
EEO
•
|
