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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 23, 2019
No Risk

There is little to no risk for black cutworm damage in the next five days.

Corn Earworm

July 23, 2019
No Risk

Corn earworm migration risks return to the forecast beginning as early as tomorrow night and lasting through the weekend as southerly flow returns to at least the western portion of the corn-growing region ahead of the next cold front. This cold front is not slated to pass through the area until late in the weekend or early next week, so a period of several days of south to southwest flow could lead to some mainly isolated corn earworm moth flights from Kansas and Missouri northward as far as eastern South Dakota and Minnesota tomorrow night into Thursday morning, with the threat spreading eastward to Lake Michigan and into Illinois by Thursday night into Friday morning. Over the weekend, confidence does lower a little bit with respect to just exactly when the front moves southeast, but all indications this morning show the front passing through sometime late Saturday in the far northwest portion of the corn-growing region into Monday across the southern Great Lakes and eastern corn-growing region. Low risks focus along/east of the front during this time. Growers with crops at susceptible stages to damage should monitor traps and scout fields regularly as some new moths may have arrived this past weekend and prospects for at least a few more moths late this week into the weekend are there.

Corn Rootworm

July 23, 2019

While some corn rootworm hatches may still be occurring in far northern areas (North Dakota, northwest Minnesota, central Ontario, Canada), the primary concern as we move into pollination is with increasing beetle emergence and potential silk clipping. Virtually the whole of the corn-growing region is included in the High risk for potential corn rootworm issues, including northeast Colorado, Kansas, Nebraska, South and North Dakota, Minnesota, Iowa, Missouri, Illinois, Wisconsin, lower Michigan, Indiana, Ohio, and into southern Ontario, Canada. Growers with crops at a susceptible stage of damage, including fresh silks, should scout fields regularly and take note of beetle populations. Pressure is likely to be quite variable this year even across adjacent fields so scouting of all susceptible fields is recommended.

Soybean Aphid

July 23, 2019

Low soybean aphid risks are in the forecast across the northern soybean-growing areas for the next week and beyond, including Minnesota, Wisconsin, northern Iowa, far northeast Nebraska, eastern South Dakota, and southeastern North Dakota. With soybeans now entering the early reproductive stages of growth, it will be important for regular scouting to occur in these fields especially with near to slightly below average temperatures and less rainfall over the next week. Soybean aphid populations can grow rather quickly especially provided suitable hosts and favorable weather.

Western Bean Cutworm

July 23, 2019

Western bean cutworm moths continue to emerge in the usual “hot spots” for this particular insect, especially across the central Plains and in the Great Lakes region. Egg laying/hatching is also occurring, and with a higher percentage of the corn crop nearing or in pollination/silking growth phases, Moderate risks continue across far northern Kansas, northeast Colorado, and into Nebraska. Additional Moderate risks are now in the forecast across central and northern Indiana, northwest Ohio, and into southern lower Michigan, as well, as crops in this area are beginning to reach or are in susceptible stages to damage. Low risks surround the Moderate risk areas where more isolated problems are expected, including far southern South Dakota, far western Iowa, extreme northwest Missouri, Wisconsin, and into central lower Michigan and southern Ontario, Canada. Growers are advised to not only regularly check traps but more importantly scout fields and look for egg masses and even potential larvae if the crop is at that point and where ears may be affected. Any treatments needed are very time sensitive as to their effectiveness so regular scouting is strongly encouraged.