If you have received rain or have irrigated soybeans, dimethoate should provide adequate control. If spraying by ground or air, crop oil or organosilicone should be used. The best control will be achieved with the addition of an organosilicone. Every year we can easily find aphids feeding in the center of whorl stage plants. In most cases, the predominant species is the corn leaf aphid and generally no controls are needed.
Beneficial insects are very active and helping to crash the populations.
Dimethoate is the material of choice for control. The most consistent top yielding varieties across all locations were Pennco and Acton. While Starling and Luttrell performed well in the souther half of the state, Pennbar 66 did well in the northern half of the state. All fields should be sprayed on a 7 day schedule except in the Harrington area where sprays are needed on a 4-5 day schedule. Orthene or Lannate should be used.