The soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is a major pest of soybean (Glycine max L.). This aphid is a native of Asia and was first discovered in the United States in Wisconsin in July 2000, and in North Dakota in summer 2001. Management of the soybean aphid varies across the geographical range of the pest. The impact of the soybean aphid has been less in North Dakota compared to many areas of the Midwest. One reason is environmental conditions in North Dakota limits population growth of the soybean aphid. Another is that until recently the area of soybean hectares in North Dakota has been limited. But now production has increased and growers are expecting integrated pest management programs designed specifically for North Dakota conditions. This research addresses how insecticides and resistant soybean cultivars might be used to control North Dakota populations of the soybean aphid. The objective of the first study was to determine efficacy of foliar and seed treatments for controlling the soybean aphid. Effects on beneficial insects were also determined. The foliar insecticide lambda-cyhalothrin (Warrior) was applied to soybean at different plant growth stages. The seed treatment thiamethoxam (Cruiser Maxx) was applied alone and in combination with the foliar insecticide lambda-cyhalothrin (Warrior). A foliar application of lambda-cyhalothrin (Warrior) applied at the economic threshold of 250 aphids per plant was the most effective control method. Seed treatments were not effective, probably because insecticidal effects had declined by the time aphids were invading the crop. The objective of the second study was to evaluate experimental soybean lines for resistance to soybean aphid. The first experiment was conducted in the greenhouse and involved 436 soybean lines. The second experiment included 30 susceptible lines and 25 resistant soybean lines at two field sites. The third experiment included the same lines that were evaluated in the field, but this screening was conducted in the greenhouse and involved caging aphids. In general, ranking of the lines for resistance was consistent between the first greenhouse experiment and the field experiment, suggesting that greenhouse screening is an effective method for scoring soybean lines for resistance and can be used to accelerate progress in soybean breeding programs. Five experimental lines, known to have the Ragl gene that confers resistance to soybean aphid, maintained aphid levels below the economic injury level. The economic injury level is 674 aphids per plant when the plant is at the reproductive stages. The third experiment, which caged aphids on leaves of susceptible and resistant lines in the greenhouse, was not an effective method for scoring resistance.