The soybean aphid, Aphis glycines, was first discovered in North America in July 2000 in Wisconsin. Since its discovery the soybean aphid has spread to 20 states, including Nebraska in 2002. An important aspect of soybean aphid management is understanding the factors that influence the soybean aphid's survival and population growth. Developing an understanding of different biotic factors that affect the aphid can be used to estimate population growth and subsequent injury rates. The objective of this study was to determine the effects of arthropod predators and parasitoids on soybean aphid establishment and population growth. Aphid predator and parasitoids populations were monitored in a series of field cages (cage size: 6'X6'X12'). Treatments were 1) a 32 mesh cage enclosure that excluded predators and parasitoids, 2) an 18 mesh cage enclosure that excludes large predators (e.g. lady beetles) but allows parasitoids and small predators entrance, 3) a caged control with 18 mesh cage pulled partway up on sides to allow entrance of large and small predators and parasitoids, and 4) an un-caged control. Hobo Outdoor/Indoor 4-channel data loggers were installed to collect temperature data. When natural colonization occurred (as indicated by the Nebraska Soybean Aphid Survey and Early Warning Program), cages and controls were artificially infested with aphids. Population development was assessed by collecting and examining plants weekly and recording the numbers of aphids, aphid predators, and aphid mummies by plant part as well as recording the plant stage, date, etc. Results will be presented.