In the News - May 2008
Flood of insects may spell problems for farmers, communities
LITTLE ROCK - Recent flooding along Arkansas rivers is likely to result in a
flood of insects affecting major crops and people living in communities near
flooded areas, say extension experts with the University of Arkansas Division of
Agriculture.
Dr. John Hopkins, extension urban entomologist, said populations of black
flies and mosquitoes could thrive in flooded areas and pester people in nearby
communities.
Meanwhile, major delays in planting crops caused by the flooding could set
farmers up for big insect problems in late summer, said Dr. Gus Lorenz,
extension entomologist with the University of Arkansas Division of Agriculture.
"We're seeing major planting delays. By this time in most years, we're
through planting rice and corn, almost through with soybeans and heavy into
cotton," he said.
"Farmers like to plant many crops early in the season to avoid late-season
insects. I'm afraid the flooding is going to set us up for potential late season
pest issues, especially in corn, cotton and soybeans," Lorenz said.
Many problem insects migrate into Arkansas late in the season from the south,
so the later farmers plant, the greater the opportunity for late-season insects
to become established, as crops are beginning to mature. If crops are mature
when insect infestations occur, the risk of yield loss is greatly lessened.
Last year, Lorenz recalled that farmers avoided a lot of bollworm problems in
cotton because they were able to plant early. Many farmers escaped having to
treat for bollworms.
The entomologist said if certain environmental factors fall into place this
year, late-season plant bugs and fall army worms could wreak havoc in cotton. In
soybeans, loopers and plant bugs will be hard to deal with, he said.
"The later we plant rice, the more subject we are to problems with rice water
weevils," he said.
The problem could be worsened if Arkansas experiences a dry July and August.
He said caterpillar pests thrive in dry conditions.
"Generally, when we get too much rainfall early,"Lorenz said, "we're going to
pay for it later on when it gets dry."
Lorenz said it's not all doom and gloom.
Flooding may have reduced populations of some pests. Stemborers in soybeans
grape colapsis in rice may be seriously impacted in some flooded areas. He said
the insects overwinter in the soil or debris that has been covered by water for
an extended period of time.
"Budworms and bollworms overwinter in the ground too,"Lorenz noted, "but
it's their migrating cousins that could cause the problems.
"We may see a mixed bag of insect problems, with some areas lighter than
normal and some heavier than normal. It's not as clear cut as you would think,"
he said.
Hopkins said mosquitoes will breed in the many stagnant pools left behind by
the flooding. Black flies breed in moving water.
"There's little anyone can do about controlling biting black flies. All you
can do,"
he said, "is protect yourself from bites by wearing long-sleeve shirts,
hats and insect repellents containing DEET or picaridin. Avoidance is another
option. Black flies usually don't enter buildings in large numbers and feed ONLY
during daylight hours.
Adult black flies, he noted, usually live from two to three weeks and peak
occurrence in Arkansas is in the spring.
"Mosquitoes are a problem from spring until the first freeze,"Hopkins said.
"Not only are they nuisance biters, but they can transmit various diseases,
notably West Nile virus. The same precautions used against black flies should
help prevent mosquito bites."
For more information about insects in your area, contact your county
extension agent or visit www.uaex.edu
and select "Agriculture," then "Ask the Pest Guys." The Cooperative Extension
Service is part of the U of A Division of Agriculture.
May 2, 2008
By Kelli Reep
For the Cooperative Extension Service
Media Contact: Lamar James
Extension Communications Specialist
U of A Division of Agriculture
Cooperative Extension Service
(501) 671-2187 or (501) 753-0207
ljames@uaex.edu
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