Figure 1. 2004 soybean aphid abundance at a research farm in Story County. Average number of soybean aphids per plant from field plots left untreated (solid line) or treated with Warrior (lambda-cyhalothrin) at 3.2 oz/acre, using 20 gallons of water/acre as carrier. Nozzles used were TeeJet 11002 twin jet on 15-in. spacing at 40 psi. Treatments were replicated 4 times, and the soybeans were planted in plots that measured 65 ft long 3 20 ft wide. Soybeans (Novartis 524-K4 RR) were planted in 30-in. rows at 196,000 seeds/acre.