Corn earworm migration risks are expected to remain primarily in the Plains and western corn-growing region through the next five days. High pressure currently in southern Canada is predicted to move southeast into the Great Lakes and eventually eastern Midwest by the end of the week. As a result, any southerly winds will remain confined further to the west. Initially, Low corn earworm migration risks are predicted for Nebraska and southwest Iowa and points south as mainly weak southerly winds persist overnight tonight into early tomorrow morning.
By later Wednesday evening and into Thursday morning, Moderate corn earworm migration risks are predicted from I-90 south and also generally west of US 71 and I-35 as southerly winds increase across this area. Low risks extend as far north as the North Dakota/South Dakota border into central Minnesota. With a largely stagnant weather pattern expected to remain in place into next weekend, risk levels and areas remain unchanged from tomorrow’s forecast except Moderate risks persist only through Friday morning in the Plains and western Midwest.