This new pest landed in southern fields in 2009 and is headed north.
Kudzu, commonly called the "vine that ate the South," has been despised in the region for more than 100 years. Now, soybean farmers there face a new foe with a similar name, the kudzu bug, and the pest has spread rapidly through much of the Mid-Atlantic, Southeast and Mid-South.
While kudzu bugs get their name from the fact that they feed on kudzu, they have a voracious appetite for soybeans as well. They feed on the plants by inserting piercing mouth parts into the soybean leaves and stems to suck the nutrient-laden sap.
"The more bugs in the crop, the poorer the seed weight of your soybeans," says Jeremy Greene, a Clemson University Extension entomologist.
Greene addressed a group of agricultural media about the kudzu bug during the 2014 Commodity Classic. The event was sponsored by Chemtura AgroSolutions, the manufacturer of DoubleTake insecticide.
Researchers first identified the kudzu bug in 2009 in a nine-county area in northeast Georgia. They speculate the pest snagged a ride on a plane to travel from its native home in Asia to the United States.
Its ability to hitchhike has enabled kudzu bug to develop into a significant economic pest during the past four years in states including Alabama, Georgia, Florida, North and South Carolina, Tennessee and Virginia.
Average yield loss for untreated soybeans attributed to kudzu bug has been observed by Extension entomologists at 20% in South Carolina and Georgia, and losses as high as 50% have been reported.
Greene says he wouldn’t be surprised to see the pest show up in parts of the Midwest as it is moving in that direction.
"If it can stand the winters, I think it will eventually be up there," he speculates. "It will be interesting to see how far it can go in those colder climates."
According to information on the website kudzubug.org, the pest overwinters as adults near kudzu patches and soybean fields in southern states on plant debris and behind tree bark, but it will also overwinter in structures such as houses and other buildings.
In spring, the adult pest emerges from overwintering sites and moves into kudzu or wisteria where they mate, lay egg masses, and develop through five nymphal stages before moving into soybeans as adults.