Corn Earworm
Corn earworm migration risks will be in the forecast on a nightly basis into early-mid next week until a cold front finally passes far enough south into the southern corn-growing region to limit much, if any, risk. Low migration risks are predicted tonight into tomorrow mainly along/east of the I-35 corridor south of I-90 as far east as roughly the I-75 corridor or from eastern Kansas and central Iowa east as far as lower Michigan, Ohio, and Kentucky. As southerly winds increase and more organized precipitation chances increase by later Saturday into Sunday, enough confidence is there to introduce Moderate migration risks across a portion of Iowa, Minnesota, Wisconsin, and Illinois with Low risks roughly along/east of the Missouri River valley as far as the southern Great Lakes. Low risks continue in the forecast roughly along/south of I-90 late in the weekend and into early next week as a frontal boundary is expected to remain largely near the I-80 corridor. This front will waver back north and south as it will be affected by thunderstorm complexes, so the general concern is along/south of I-90 but ultimately the better risk may focus closer to between I-70 and I-80 during this time until the front passes through by mid-week next week. Growers with crops at susceptible stages to corn earworm damage should continue to monitor traps and scout fields as some new moth flights will be possible in the next week.

