Effects of flooding and saturated soils on corn
The timing of larval hatch is dependent upon heat units and will vary across the Corn Belt. Research shows that fifty percent of corn rootworm larvae will hatch from 684 to 767 accumulated growing degree days, starting January 1. The University of Illinois, along with other insect prediction calendars, predicted the first corn rootworm hatch of 2013 would take place over Memorial Day weekend in parts of central Illinois. You can determine how many growing degree days have been accumulated in your area by using the Growing Degree Day Calculator found here: http://www.weather.com/outdoors/agriculture/growing-degree-days/USIL0935%3A1
The full extent of damage from flooding and saturated soils cannot be seen until the corn plant has a chance to recover. Knowing what factors affect damage and survivability, and what signs to look for when assessing plant health will help you make the best decision for the long term success of your corn crop.
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