SDSU publication on soybean aphid available

SDSU publication on soybean aphid available A new publication from South Dakota State University Extension offers tips on managing soybean aphid, one of the newest insect pests in South Dakota.

SDSU Extension Fact Sheet 914, "Soybean Aphid in South Dakota," is available online in pdf format at Or ask for it at county Extension offices.

SDSU Extension Entomologist Mike Catangui wrote the publication, which is made possible through research and Extension funding and a grant from the South Dakota Soybean Research and Promotion Council.

Catangui said although soybeans were introduced to what is now the United States as early as 1765, the soybean aphid was detected in the U.S. only in year 2000 in Wisconsin. It was first detected in South Dakota in 2001 and had been confirmed in 20 South Dakota counties by 2002.

Catangui's publication gives tips on scouting, identification, life cycle, plant injury, economic threshold, and insecticides labeled for use against the pest. An average of 200 or more soybean aphids per plant is considered economically damaging, Catangui said.

"Because the soybean aphid is a new pest of South Dakota soybeans, there are still many variables that need to be investigated before we can fully understand the injuries that these insects cause at any given time or plant stage," Catangui said. "Some of these variables are soybean variety, plant population, row spacing, and location in the state. Eventually, soybean aphid management will need to be adjusted for the diverse soybean growing conditions in South Dakota."

Soybean aphid research will continue at SDSU, Catangui said.

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