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Insect 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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August 29, 2014
Corn Earworm

Increased corn earworm migration risks continue through early next week as no less than two separate cold fronts are predicted to pose at least scattered to potentially widespread corn earworm migration flights. Flights have already been reported in the last week especially west of Lake Michigan, and these flights may continue to expand to the east into the Great Lakes region and eastern Midwest this weekend as a favorable weather pattern for migration is predicted with southerly winds and scattered to widespread precipitation ahead of the cold fronts. Moderate risks are in place tonight from northeast Missouri into far eastern Iowa, central and southern Wisconsin, Illinois, Indiana, northwest Ohio, and southern lower Michigan. Low risks extend east into Pennsylvania and southern Ontario, Canada. The first cold front is predicted to push east into the western Great Lakes region by Saturday, and with southerly winds originating over active corn earworm populations in the mid-south region, a High risk is being issued for southeast lower Michigan, northeast Indiana, northern Ohio, and southwest Ontario, Canada. The high risk has been shifted just a little bit to the east given a slightly faster than predicted cold frontal passage. Moderate risks extend back to I-57 in eastern Illinois and also north into central lower Michigan and as far east as northwest New York, southern Ontario, Canada and northwest Pennsylvania. Low risks are already back in the forecast across the Plains by tomorrow night as the next weather system organizes. By late in the weekend and early next week, Moderate risk ahead of the second cold front are in place from northeast Kansas, eastern Iowa, southeast Minnesota, and eastward into the southern Great Lakes region and eastern Midwest. The second front may produce additional flights, but coverage is not expected to be quite as high given the quick movement of the front and potential precipitation keeping moths less active closer or in mid-south and southern Midwest source regions by that time. Growers especially located in the upper Midwest where crops are still at susceptible stages to damage should be closely and regularly monitoring traps and field conditions as some intense moth flights have occurred in the last week and the potential continues for additional flights into early next week.

August 29, 2014
Western Bean Cutworm

Western bean cutworm risks remain in the Moderate category across a portion of the Great Lakes region and also a small section of the Plains states, but the overall threat from this insect this growing season is now waning as the primary flight is subsiding and crops advance past critical growth stages. Moderate risks remain in place from central lower Michigan east into southern Ontario and southwest Quebec, Canada where the greatest risk remains in place in the next week. Additional Moderate risks remain in place across northeast Nebraska, northwest Iowa, and southeast South Dakota where replanted fields due to hail/heavy rainfall in early June may still be at susceptible stages to damage and also where some traps continue to catch more than just a few moths a night at least on a scattered basis. Low risks extend from Nebraska and southern South Dakota east into Minnesota, northern Iowa, Wisconsin, lower Michigan, far northern Indiana and Ohio, northwest Pennsylvania and New York, and southern Ontario and Quebec, Canada. Growers located especially in Moderate risk areas are urged to continue to check traps for moths and fields for signs of larvae and egg-laying especially if the crop is at a susceptible stage to damage from this particular insect.

August 29, 2014
Corn Rootworm

High corn rootworm risks continue across much of the corn-growing region this week as beetle activity is expected to persist in scattered locations. Fields from eastern Colorado into western and northern Kansas, Nebraska, eastern South and North Dakota, Minnesota, Iowa, northern Missouri, northern and central Illinois, Wisconsin, lower Michigan, northern Indiana and Ohio, and southern Ontario, Canada are all at continued risk especially in fields that are later planted or were re-planted. All growers should monitor beetle counts as high beetle numbers may signify that the field is prone to problems in 2015, and a change in planting practices/rotation and the need for treatment at planting may be needed. Risks are being reduced in the southwest portion of the corn-growing region as crops advance past critical growth stages and are no longer a threat from this particular insect for this growing season.

August 29, 2014
Soybean Aphid

Moderate soybean aphid risks continue especially across the upper Midwest from eastern North Dakota southeast into Minnesota, far northern Iowa, and also into west central Wisconsin this week. Low risks continue from the eastern Dakotas into northeast Nebraska, northern Iowa, Minnesota, Wisconsin, northern Illinois, northern Indiana and Ohio, and lower Michigan in addition to southern Ontario, Canada. Continued isolated to scattered reports of soybean aphids reaching or exceeding economic threshold values are coming in from the Low risk area, with greatest concern in the Moderate risk area where more problems, although still scattered in nature and now dwindling as crops move past critical growth stages, persist. The greatest concern at this point is in late or re-planted fields across the upper Midwest where conditions are drier as these fields will be most attractive to soybean aphids in the coming weeks. Recent and expected heavy rainfall events, however, may keep soybean aphid counts lower in some areas and predators continue to keep populations in check in some regions as well. Still, if you have fields located in any risk area, it is encouraged that you continue to scout until the soybeans advance past the R5 growth stage as populations can migrate and/or increase in population quickly.

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