As high pressure moves back into the southeast United States, corn earworm migration risks will increase especially in the Plains and western corn-growing region as south to southwest winds commence in organized fashion. Low migration risks are predicted tonight into tomorrow morning mainly across Nebraska and Kansas as high pressure will still be in control across the central corn-growing region. The risk area, however, expands north and east by Saturday night and Sunday morning as the high pressure center moves further southeast. Fields as far north as Minnesota and Wisconsin are at risk for isolated corn earworm flights at this time.
While some risk may extend into Iowa, Missouri, and portions of Illinois late in the weekend as a cold front sags southeast, the main risk area is expected to re-focus back in the Plains states as weak high pressure moves into the Midwest by early next week. Throughout the next five days, southerly winds are not expected to be particularly strong and with most areas seeing corn crops further behind in growth compared to last year at this time, only Low risks are being issued at this time.