Northwest flow is expected to dominate the weather over the corn growing region for much of the weekend, so there is no risk of corn earworm migration until Sunday night ahead of the next developing low pressure system in a progressive flow. Low risks are initially found mainly in the Plains states from northern Kansas into South Dakota at that time. Low risks then spread east as far as Lake Michigan and into Illinois and north into the I-94 corridor from North Dakota into Minnesota as south to southwest winds push east early next week, with the risk extending into Wisconsin and Illinois. Concerns over rainfall and associated contamination especially in the upper Midwest north of I-80 precludes a higher risk at this time. Growers with crops at susceptible stages of growth should continue monitoring traps and scout fields as flights have occurred in the past week or so on a scattered basis, especially in portions of the upper Midwest.