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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 19, 2014
Corn Earworm

Corn earworm migration probabilities are on the rise in the next week as the weather pattern across the corn-growing region shifts in a more zonal or even southwest flow especially later this week and next weekend. For most of the summer, the weather pattern has been dominated by northwest flow, and this has kept corn earworm migration events rather limited. With the pattern shifting to a more favorable setup for potential migration, risks are being increased especially across central and western portions of the corn-growing region in the next five days as low pressure slowly moves through the Plains and upper Midwest and high pressure settles into the southeast United States. In between these two features, south to southwest winds are expected and may lead to migration events. Low risks are in place tonight mainly across Kansas and Nebraska as southerly winds commence in that area. Moderate risks, however, are in place across the same region in addition to southwest Iowa and northwest Missouri tomorrow night into Thursday morning as south to southwest winds increase. Low risks extend north into South Dakota, Minnesota, and Wisconsin as well as east into Illinois. Moderate risks are in place throughout the entire extended forecasting period as well, with the risk extending as far north as southeast South Dakota, Minnesota, and Wisconsin, and as far east as Illinois. Low risks are predicted into central Minnesota and Wisconsin as well as southwest Michigan and Indiana. Growers with crops at susceptible stages to damage are urged to monitor traps over the coming week, especially if in an area along or west of Lake Michigan and the Illinois/Indiana border as scattered moth flights will be possible.

August 19, 2014
Western Bean Cutworm

The annual western bean cutworm flight continues in some regions but is starting to decrease especially in central and southern fields. Moderate risks continue across portions of northeast Nebraska into western Iowa as well as primarily central and northern Wisconsin, lower Michigan, and southern Ontario, Canada. Moth captures have also recently increased as far northeast as southwest Quebec, Canada, so Moderate risks are in place there as well. Low risks remain in place from Nebraska and South Dakota east into Minnesota, Iowa, northern Illinois, Wisconsin, far northern Indiana, northwestern Pennsylvania, northwest and upstate New York, lower Michigan, and into southern Ontario and southwest Quebec, Canada. The Moderate risk areas to the west of Lake Michigan do decline in spatial coverage as the week progresses with increases in coverage now primarily focused into Canada. Growers with fields at susceptible stages to damage should continue to monitor for not only moths but also egg masses regardless if moths are caught. Egg masses can appear even when no moths are captured in a trap.

August 19, 2014
Corn Rootworm

Corn rootworm risks remain in place across a large portion of the corn-growing region as adult beetle emergence and feeding continues in scattered areas. The greatest pressure at this time is focused primarily north of I-80 as corn crops further to the south advance past critical growth stages. Still, late or re-planted fields all across the corn-growing region are at risk. Growers from eastern Colorado into Kansas, Nebraska, South and North Dakota, Minnesota, Iowa, northern Missouri, central and northern Illinois, Wisconsin, Michigan, Indiana, Ohio, and southern Ontario, Canada should continue to monitor beetle populations as some problems have been observed on at least a scattered basis. Beetle counts and economic thresholds should be monitored closely and, if necessary, treatment and changes to planting habits may be needed next growing season.

August 19, 2014
Soybean Aphid

Moderate soybean aphid risks remain across northern Iowa into southern and central Minnesota this week with additional Moderate risks now in place across northwest Minnesota and far eastern North Dakota. Low risks are predicted across eastern South Dakota, central North Dakota, northeast Nebraska, the remainder of Minnesota, northern and central Iowa, northern Illinois, Wisconsin, lower Michigan, northern Indiana, northern Ohio, and southern Ontario, Canada. Scattered reports of economic thresholds being met or exceeded as well as some insecticide treatments continue to come in especially from within the Moderate risk area, however, many fields especially across the southern portion of the risk region are now advancing past critical growth stages where yield loss from soybean aphids occurs. Nonetheless, late planted or re-planted fields still in growth stages prior to R5 should continue to be scouted regularly. In addition to crop growth stage, treatment decisions should be made based on what populations are doing in specific fields and not necessarily what neighbors are doing or what the regional report is suggesting. Soybean aphids are hit and miss especially in areas that contain fields with varying planting dates. Weather conditions across the risk area especially west of Lake Michigan may be less favorable for continued soybean aphid population increases in the week ahead as prospects for locally heavy rainfall and potentially warmer temperatures may result in slower or less widespread population increases.

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