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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

July 22, 2016
No Risk

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

Corn Earworm

July 22, 2016

Scattered corn earworm moth flights are anticipated across a large portion of the corn-growing region over the next three days as a cold front moves southeast through the central part of the country. South to southwest winds in advance of the front along with precipitation near the front should lead to an increase in moth flights through the weekend and into early next week. Moderate corn earworm migration risks are predicted tonight into tomorrow morning from Kansas and Missouri north into Nebraska, Iowa, far western Illinois, extreme southwest Wisconsin, central and southern Minnesota, and eastern South Dakota. The cold front begins pushing southeast into the upper Midwest and Plains tomorrow into tomorrow night, so the Moderate risk shifts further southeast, as well, and includes fields from northern Kansas and Missouri northeast into far eastern Nebraska, Iowa, southeast Minnesota, Wisconsin, Illinois, northwest Indiana, and southwest lower Michigan. Moderate risks continue across far eastern Illinois into Indiana, Ohio, lower Michigan, and southern Ontario, Canada Sunday night into Monday morning as the cold front pushes to the south and east. Growers located in or near a Moderate risk area should monitor traps closely and take appropriate action when and where needed in the coming week. Looking ahead to next week, Low migration risks return to the Plains states as early as Monday night into Tuesday ahead of the next developing weather system and continue into mid-week.

Corn Rootworm

July 22, 2016

Corn rootworm hatches will remain possible in the next week especially along and north of the I-94 corridor in Minnesota and North Dakota, but the main threat from here on out will be with potential beetle populations reaching or exceeding thresholds and potential silk clipping as corn progresses through the pollination stage. Growers with a recent history of fields that have experienced corn rootworm problems in the past few years should pay especially close attention to beetle populations and be prepared for potential treatment and/or changes to field practices next growing season. Beetle populations should be monitored closely across the whole of the corn-growing region, especially where fields are at critical growth stages with silks present.

Soybean Aphid

July 22, 2016

Soybean aphid populations continue to increase in scattered fields especially across the upper Midwest in Minnesota and Wisconsin. Recent and anticipated heavy rain events through mid-week this week and expected heat later this week across mainly the western reaches of the risk area may limit population increases for the time being. Nonetheless, with many soybean fields in the critical early reproductive stages of growth, growers are urged to monitor population dynamics where soybean aphids are present in the next week most notably from eastern South Dakota into Minnesota and Wisconsin. Low risks extend from the central Dakotas east through Minnesota, northern Iowa, Wisconsin, and into lower Michigan and southern Ontario, Canada, as well. Population increases may become more favorable by next week with less heat and potentially fewer and less intense rain events especially across the upper Midwest.

Western Bean Cutworm

July 22, 2016

Western bean cutworm risks remain elevated across the usual hot spots for this particular insect in the next week, or across far northern Kansas into Nebraska, and also across northern Indiana, northwest Ohio, and southern lower Michigan, as well. Low risks continue across much of northern Kansas, Nebraska, southern South Dakota, western Iowa, southwest and southeast Minnesota, Wisconsin, northeast Illinois, central and northern Indiana, northern Ohio, lower Michigan, and into southern Ontario, Canada. Additional risks will be possible further north into lower Michigan this week and also into northeast Ohio, northwest Pennsylvania, western and upstate New York, and as far northeast as southwest Quebec, Canada. Growers should monitor traps closely and where moth populations are generally higher, monitor for signs of egg masses on the undersides of leaves. The annual flight should begin to subside across the Plains by the end of the month, especially with expected heat in that region in the next week, but moth captures should continue to build in scattered areas near the Great Lakes over the next few weeks.