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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

Corn Earworm

August 27, 2015

Low corn earworm migration risks are in the forecast the next three nights as a low pressure system and cold front push from west to east across the corn-growing region. Somewhat modest south to southwest winds are predicted to the east of the front along with scattered areas of precipitation, and these features may coincide to produce primarily isolated moth flights the next three nights. The risk tonight into tomorrow morning is initially across northern Kansas into Missouri, eastern Nebraska, far southeast South Dakota, southern Minnesota, and Iowa. By tomorrow night, the risk shifts east and includes fields mainly between I-35 and I-75, or from eastern Kansas and Missouri into eastern Iowa, far southeast Minnesota, central and southern Wisconsin, Illinois, Indiana, western Ohio, and southwest lower Michigan. The risk shifts mainly east of I-57 from eastern Illinois into Indiana, Ohio, southern lower Michigan, and southwest Ontario, Canada by Saturday night into Sunday morning. Growers with crops at susceptible stages to corn earworm damage should continue to monitor traps closely over the next week and also scout fields as recent moth flights have occurred in scattered areas of the corn-growing region.

Western Bean Cutworm

August 27, 2015

Western bean cutworms will continue to pose a threat to crops, mainly on a scattered basis, across lower Michigan east into Ontario and southwest Quebec, Canada as well as potentially into upstate New York and Vermont in the next week. High risks remain in place across southwest Ontario, Canada where the greatest pressure and earliest crop stages are located. Moderate risks for more scattered problems remain in the forecast across central and eastern lower Michigan with Low risks in place from lower Michigan east into parts of New England, as well. All risks have been removed west and south of the Great Lakes as the majority of crops are past critical stages of growth and also where peak flight has largely ended for this growing season. Growers in the Great Lakes region, however, are advised to continue to monitor traps and scout fields as damage will still be possible to corn and other vegetables/crops in the next week or so until the annual flight subsides.

Corn Rootworm

August 27, 2015

Corn rootworm risks remain in the High category as reports of corn rootworm beetle activity continue to come in especially across the northern half or so of the corn-growing region. High risks remain in place this week across far northeast Colorado, Nebraska, South and North Dakota, Minnesota, Iowa, northern Illinois, Wisconsin, lower Michigan, northern Indiana and Ohio, and into southern Ontario, Canada. Growers should continue to monitor beetle populations for the next week or so as high beetle populations, even in fields that are past critical growth stages, may indicate the need to adjust planting decisions for next growing season. Where crops are still at susceptible stages to damage, growers should also consider possible treatment especially if threshold values are exceeded. Risks are being removed across the southern portion of the corn-growing region as any corn rootworm beetles in these areas should not pose a threat and also where beetle counts should be on the decline due to a less favorable host as corn continues to advance in maturity.

Soybean Aphid

August 27, 2015

Soybean aphid risks remain in the forecast for the next week, but overall risks are on the decline for this growing season as an increasingly larger percent of the soybean crop is now past critical growth stages where much, if any, economic impacts are found and additionally, soybean aphids may already be migrating back to buckthorn, their overwintering host, as rather cool and windy weather enveloped much of the upper Midwest in the latter half of this past weekend. Given these factors, only Low risks remain in place to the west of Lake Michigan to mainly cover late-planted or slowly-maturing fields where some isolated problems and spraying may still be warranted. Moderate risks do remain in place this week across lower Michigan east into southwest Ontario, Canada where soybean crops are not quite as far along in their maturity and where some isolated to potentially scattered problems may still occur, especially in the next week. Growers with soybeans in growth stages before R6 are still advised to continue to scout fields and take appropriate action based on what is occurring in specific fields.