The effects of irrigation, planting date, and maturity class on soybean aphid population dynamics and on soybean yield and physiology were examined by field experiments at the Haskell Agricultural Laboratory (HAL), Northeast Research & Extension Center, Concord NE. from May 2005-Sept. 2006. Aphid counts and plant stage data was taken twice weekly and recorded. At harvest, yield component analysis was done. The results of this study show how irrigation, planting date, and maturity group affect soybean aphid, and will help determine effective management strategies for the soybean aphid.