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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 Black 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

July 21, 2017
No Risk

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

Corn Earworm

July 21, 2017

A cold front will push southeast through much of the corn-growing region by the end of this weekend. Before the front passes through, however, south to southwest winds are expected to blow north from source regions across the mid-south and may lead to scattered corn earworm moth flights especially into far eastern Nebraska, Iowa, northern Illinois, and far southern Wisconsin tonight into tomorrow morning. Moderate risks are in the forecast across this region with Low risks just slightly north of the Moderate risk area and east to the Illinois/Indiana border. Low risks follow the front east tomorrow night into Sunday morning, mainly to the east of I-55 in central Illinois. A break in migration chances is in the forecast until next Tuesday night into Wednesday as a period of northwest flow and resultant cooler/drier conditions returns. Low risks are then back in the forecast by mid-week mainly west of I-35 as the next weather system develops and spreads its southerly winds back into the Plains and western corn-growing region.

Corn Rootworm

July 21, 2017

Corn rootworm hatches will remain possible across especially far northern corn-growing region fields from North Dakota into northwest Minnesota and eastward into Minnesota, northern Wisconsin, portions of central lower Michigan, and into Ontario, Canada. Elsewhere, beetle presence will eventually become the primary concern and where fresh silks are present, growers are encouraged to count beetles and take note if counts meet or exceed threshold values for this insect. Virtually the whole of the corn-growing region is at risk of seeing some corn rootworm issues in one form or another from Kansas north into North Dakota and as far east as Ohio, Michigan, and into southern/southeastern Canada, as well.

Soybean Aphid

July 21, 2017

As soybeans advance in their growth into the reproductive stage, soybean aphid concerns will be on the increase especially across the northern portion of the soybean-growing area from North and South Dakota east into northwest and central Minnesota as well as portions of central and northern Wisconsin in the week ahead. Growers with fields at or beyond the blooming stage should be scouting fields more intensely at this point and continue to do so for the next several weeks. We anticipate an increase in risk levels especially if average or below average temperatures remain in place for at least a few days especially north of the US 20 corridor.

Western Bean Cutworm

July 21, 2017

Western bean cutworm flights continue to increase especially across portions of Nebraska and also into the Great Lakes region from Wisconsin into northern Indiana, southern lower Michigan, far northwest Ohio, and also into southern Ontario, Canada. The flight appears to be lessening somewhat across northern Kansas and extreme southern Nebraska and also in portions of Indiana but is increasing at locations to the north. Moderate risks continue in the forecast this week across Nebraska and also across a larger portion of Wisconsin and further east into northern Indiana, northwest Ohio, central and southern lower Michigan, and into southern Ontario, Canada. Growers across all of these geographies should be regularly scouting fields, monitoring traps, and applying insecticide where conditions are warranted. Not all fields will experience problems from this insect, so it will be important to monitor your own fields to assess populations and not rely solely on what the local report or gossip at the local cafe is suggesting as levels are likely to vary from field to field.