Treatment guidelines for grasshoppers on corn are not well established. Information on beans, specifically soybeans is a little better. Many of these infestations will be the heaviest on the field margins. Treating these areas may lessen the total numbers of grasshoppers successfully entering a field. Of greater concern, would be direct feeding damage to pods and seeds.
Grasshoppers are able to chew directly through the pod walls and damage seed directly.
There has not been a great deal of focus on wheat stem sawfly over the past three seasons. When it has been a problem, it has been in the drier areas of western North Dakota. In fields with a history of problems, it is time to assess whether sawfly is present in fields and at what levels. By inspecting fields now, you may be able to plan cultural practices designed to limit losses and impact overwintering survival. Waiting till harvest or fall will limit your options, so don't delay.