Soybean aphid

Soybean Aphid

The soybean aphid is a pest that is exotic to North America.The soybean aphid is native to Asia. It has been described as a common pest of soybeans in China and as an occasional pest of soybeans in Indonesia,Japan,Korea, Malaysia,the Philippines,and Thailand. The soybean aphid was first documented in North America in Wisconsin in July 2000.

By 2003, the soybean aphid had been documented in Delaware, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New York, North Dakota, Ohio, Pennsylvania, South Dakota, Virginia, West Virginia, and Wisconsin.

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The current economic threshold for soybean aphids states that an insecticide application is warranted when soybean aphid densities reach 250 soybean aphids per plant, 80% of sampled plants are infested, the population is currently increasing, and few natural enemies are observed in thefield.