July 1, 2014
Storm Damage to Crops
Significant crop damage occurred between the evenings of June 29 and June 30 over a large area.
1. Farmers should contact their crop insurance company if the crop sustained any injury. Even if the crop appears to be in a condition to fully recover, it is still best to be sure the insurance company is fully aware of what happened.
2. Some areas had hail. Several resources on assessing and responding to hail damage are at http://www.extension.iastate.edu/Pages/eccrops/cu.html.
3. There was significant flash flooding and there are still large ponds in many fields. Corn and soybeans can normally only survive complete submersion for 4 days (77 degree F. day air temperature) and most forages can survive for 1 - 2 days. I have seen survival for considerably longer periods of submersion, however. The cooler the air temperature, the longer the plants can survive. Plants NOT totally submerged will survive considerably longer. By the time the water has receded and the field dries out, it will be easy to see whether the crop has survived or not.
4. Near or above hurricane force winds flattened many corn fields. So far, what I have seen is mostly root lodging (plants leaned over) and minimal green snap. This suggests that most corn fields will goose neck back to an upright position with little or no yield loss. However, farmers should be preparing for a difficult harvest in those fields and making arrangements for any needed attachments or adjustments to corn heads. In 2011, Roger Elmore wrote a great overview of types of wind damage that can occur and the implications of each at http://www.extension.iastate.edu/CropNews/2011/0712elmore.htm.
5. It is too late to re-plant corn, and soybeans planted at the time when field conditions are suitable are very questionable at best. It will probably be best to do any planting yet this summer to summer forages or cover crops. On June 29, 2010, Steve Barnhart wrote an article on forage and cover crop options at http://www.extension.iastate.edu/CropNews/2010/0629barnhart.htm. Be sure the appropriate crop insurance company is on board before doing this.
6. Iowa State University Extension and Outreach has many resources at http://www.extension.iastate.edu/content/dealing-flooding-2014.
FOR YOUR CALENDAR
Mid-season Crop Management Clinic
9:00 a.m., Wednesday, July 9, 2014
Details are at: http://www.aep.iastate.edu/feel/mid.
Late-season Crop Management Clinic
9:00 a.m., Tuesday, August 19, 2014
Details are at: http://www.aep.iastate.edu/feel/late.
If you have any questions, please feel free to contact the Iowa State University Extension Office.
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