What is in this article?:
- Kudzu bug spreading rapidly across Southern states
- Feed on main stem
• The bean plataspid, or kudzu bug, munches on kudzu and soybeans and has now set up residence in four Southern states.
• Homeowners consider the bug a nuisance. Soybean producers shudder at the damage it causes. And many are hoping it will prove to be a kudzu killer.
KUDZU BUGS hiding behind tree bark
Feed on main stem
The bugs don’t eat soybeans. Instead, “they have a sucking mouthpart, and they use it to feed on the main stem,” Roberts said. “This adds additional stress to the plants.”
CAES entomologist David Buntin has found that plants the bugs were eating had fewer pods and fewer seeds in the pods.
“If they fed on the pod, the bean itself, I don’t know that we could grow soybeans in Georgia,” Roberts said. “The main point is it’s a yield-limiting pest, and it’s just incredible how it has moved so quickly across the Southeast.”
Munching on kudzu
Last fall, Wayne Gardner had to search repeatedly to find the pest in kudzu patches in north Georgia. “Those areas are loaded with bugs this year,” he said.
By studying the pest for the past year, Gardner has determined wisteria, green beans and other legumes are the bug’s true hosts in the landscapes and home gardens. A plant becomes a true host of the insect when different life stages of the insect are found on the plant, he said.
No one seems to mind if the bugs take out a 1,000 or so acres of kudzu. But are they?
“We found the bug caused a 32 percent reduction in kudzu growth last year in the plots we monitored,” said Jim Hanula, an entomologist with the USDA Forest Service. He monitored the bug on kudzu plots in Athens, Ga., for the past year.
This may sound like reason to celebrate, but kudzu roots can grow as deep as 12 feet and weigh up to 300 pounds, Hanula said.
“We’re hopeful that feeding by the bug year after year will deplete those roots and weaken the plants,” he said. If the bug’s effect is cumulative, kudzu plants will likely weaken, and patches won’t be as thick.
“Hopefully, the bug will reduce kudzu’s ability to climb, which would be good for forestry,” he said.
Like Asian lady beetles, kudzu bugs seek shelter indoors. They are attracted to light colors, especially white cars and light colored house siding.
Removing kudzu is one way to help control the pest around homes, but that’s not an easy task, especially if the kudzu is growing on your neighbor’s land.
“The bugs re-invade so quickly from nearby kudzu that a pest control operator may have to treat every other day, losing money in the process. A single call they were paid for might turn into a half-dozen visits, five of which they’d not be paid for,” said CAES entomologist Dan Suiter.
“I suspect that the pest control industry will be steering somewhat clear of kudzu bug control unless some smart pest control operator begins to market kudzu removal as part of his business.”
Having a few hundred uninvited houseguests is bothersome, but the bugs are not harmful, and they don’t feed on indoor plants.
For additional information on the kudzu bug, see http://southeastfarmpress.com/management/kudzu-bug-spreading-across-georgia.
For a detailed description of the pest, see http://southeastfarmpress.com/soybeans/bug-found-georgia-threat-soybeans.
A report from Alabama can be found at http://southeastfarmpress.com/management/new-insect-pest-marches-alabama.