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​Insect Forecast​


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Insect Migration ​Risk Forecast

Is your corn at risk? monitors weather patterns and provides daily insect migration data for crop-damaging insects such as Corn Earworm and Western Bean Cutworm.

These risk forecasts utilize strategically placed moth traps across the major crop-growing areas of the country and combined with weather patterns, can provide flight patterns up to five days in advance. Information is updated daily May through September. Stay ahead of the game with

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How to Read the Maps

Black Cutworm

August 29, 2016
No Risk

No risk of black cutworm migration is predicted in the next five days.

Corn Earworm

August 29, 2016
No Risk

No risk of corn earworm migration is predicted until late in the week and into next weekend as the overall weather pattern remains rather stagnant and wind speeds are expected to continue to be rather light or from a non-optimal direction for any migration probabilities. A developing High Plains low pressure system is in the forecast by late week, and this system should spread southerly winds back into mainly the Plains and western corn-growing region by Friday into Saturday. As a result, Low migration risks have been placed in the forecast along and west of I-35 at that time. Otherwise, growers with crops at susceptible stages should continue to monitor traps and scout fields and take appropriate action where needed as recent intense flights have left high corn earworm populations in many upper Midwest and Great Lakes fields in the past several weeks.

Corn Rootworm

August 29, 2016

As the corn crop across the majority of the corn-growing region advances past critical growth stages where corn rootworm damage is likely to occur, the overall risk from this particular insect this growing season has been reduced into the Low category this week and is mainly focused along and north of I-80 where there may still be some late or re-planted fields that could still pose an isolated risk of seeing some damage. These growers should continue to monitor beetle populations and even if treatment is or has not been needed, beetle populations exceeding threshold values may be an indicator that changes to next year’s planting rotation may need some adjustments.

Soybean Aphid

August 29, 2016

Soybean aphid risks have been reduced to the Low category for this week and and into next weekend as the majority of the soybean crop is now setting pods and the threat of yield loss from soybean aphids has diminished in many areas. Late or re-planted fields, however, may still be at risk so if you have fields that are at or prior to the R6 growth stage and you are located within or near the Low risk area, it is encouraged that you continue to scout your fields and monitor soybean aphid population trends. The risk area includes the eastern Dakotas, far northern Iowa, much of Minnesota, western Wisconsin, and portions of lower Michigan and into southern Ontario, Canada.

Western Bean Cutworm

August 29, 2016

The annual western bean cutworm flight is winding down quickly across much of the corn-growing region, but some remaining issues may still be present especially in the eastern Great Lakes region. Low risks remain in the forecast this week and into next weekend across portions of lower Michigan into southern Ontario and southwest Quebec, Canada, as some moths and egg-laying may still be present in some fields in these areas. Growers in or near the Low risk area should continue to monitor traps and scout fields, especially in late or re-planted fields. The overall threat from this insect, however, should be very limited and we anticipate removing the remaining risk area from the forecast by next week.