By Sharon Omahen

University of Georgia

About 50 men and women crowded around University of Georgia
entomologist Kris Braman as she demonstrated how quickly a pair
of tiger beetles attack and devour an armyworm. The group’s
attraction wasn’t just morbid curiosity.

Georgia golf course and landscape industry professionals spend
millions of dollars each year controlling armyworms and other
caterpillars, so they were rooting for the beetle.

A UGA College of Agricultural and Environmental Sciences
professor, Braman was one of 19 UGA scientists who shared their
latest findings with more than 900 visitors at the 2006 Turfgrass
Field Day held Tuesday, Aug. 14 on the college’s campus in
Griffin, Ga.

Bug-eating bugs

Braman’s research focuses on controlling insects that feed on
Georgia turfgrasses and ornamental plants. Her subjects include
fall armyworms, Japanese beetles, chinch bugs and two-lined
spittle bugs.

Using a predator, like the tiger beetle, to control a pest is
called biological control. This method allows farmers and home
owners to control insect pests without spraying insecticides.

“Tiger beetles are very common in landscape beds,” Braman said.
“They are very ferocious predators. I wouldn’t want to run into
one my size.”

Over the next four years, Braman will monitor how well the tiger
beetles keep armyworm and Japanese beetle grub populations down
in her research plots.

“These beetles aren’t being used much in this way, but they are
very abundant in nature,” she said. “We have been finding them
more and more in our insect pitfall traps.”

Not a new idea

Using beneficial insects isn’t a new concept to the greenhouse
and field crop industries, but it is new to the turfgrass
industry.

“The (beneficial insects) that are commercially available are not
widely used in turf,” Braman said. “We’re finding that the ones
used in greenhouses do occur in turf.”

Many greenhouse growers buy beneficial insects to control pests
on their plants. One of the most popular, the minute pirate bug,
feeds on insect eggs, caterpillar eggs, thrips, mites and small
larvae, Braman said.

One of Braman’s favorite beneficial insects is the big-eyed bug.
It feeds on soft-bodied small insects like armyworms, cut worms
and chinch bugs.

“We ought to be looking in this direction as a possibility, if
it’s cost effective,” Braman said. “It’s a matter of conserving
the predators that are already there and using management
practices that don’t eliminate the natural enemies.”