Taylor Herbert, Extension Educator, Crops - Wright, McLeod, Meeker Counties
Seth Naeve, Extension Soybean Agronomist and Professor of Agronomy and Plant Genetics
Jeff Coulter, Extension Corn Agronomist and Professor of Agronomy and Plant Genetics
Dave Nicolai, Extension Educator, Crops
Matt Pfarr, Extension Educator, Crops
When assessing corn utilize the Corn Grower’s Guide for Evaluating Crop Damage and Replant Options. Evaluations start with the growing point by splitting the stalk down the center. If the growing point has been damaged, bacteria will often invade the plant and the growing point becomes brown and soft. These plants will not recover, so count them dead. Also, count as dead plants that have restricted whorls preventing growth of new leaves. Barring these conditions, defoliation at the 10 leaf stage can be tolerable with 60% of leaf area destroyed causing 8% yield loss and 100% of leaf area destroyed causing 16% yield loss.
There is no option to replant corn at this calendar date - the cutoff has passed for planting grain corn on June 15th and planting silage corn on June 25th. Also, hold off on foliar fungicides for the sake of disease control. The corn diseases associated with hail damage are: common smut, Goss’s leaf blight and wilt, and possibly stalk rots - none of these diseases have proven effectively managed with foliar fungicide applications. Reference this Crop News article from Dean Malvick for more information on disease control in hailed corn. It can be tempting to take action immediately after a hail event, but return on investment must be carefully considered.
As with corn, assessing soybean stands, damage, and replant decisions should be made with full consultation with the appropriate insurance personnel and a careful reading of the University of Minnesota Extension’s Soybean Hail Guide.
A careful estimation of the remaining plant stand will be crucial for determining next steps. A final call on the existing stand should not be made until soybean regrowth can be carefully evaluated after a week or so. In the meantime, planning for potential management decisions may commence.
Soybean stands as low as 70,000 can produce near normal yields, so drastic mitigation strategies should be considered only in extreme cases. At this late date, spiking in additional soybeans will likely lead to a poor match in harvest maturity - leading to harvest challenges. A shift of one full maturity group earlier would be required to potentially match the full season variety.
A full replant of the soybean crop should be considered through the lens of future weed management. Farmers should consider existing weed pressure and the pre- and post-herbicide products already applied to the field. Farmers are often willing to give up some yield potential of maintaining an existing stand for better weed control by starting over with full tillage and a clean replant.
A recent publication on soybean planting dates in Minnesota shows that planting from the end of June through early July should result in yields of slightly greater than 50% of a normal early May planting date. This supports years of real-world experience by hundreds of farmers in southern Minnesota who regularly plant soybeans after canning peas. They often report 50-60% yields on soybean planted around July 1.
Again, as with corn, there is little value in treating hailed soybean with fungicides, so please save time, expense, and the active ingredients for better ROI situations. 
Seth Naeve, Extension Soybean Agronomist and Professor of Agronomy and Plant Genetics
Jeff Coulter, Extension Corn Agronomist and Professor of Agronomy and Plant Genetics
Dave Nicolai, Extension Educator, Crops
Matt Pfarr, Extension Educator, Crops
Area Storms Bring Hail Damage
Corn
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| Recent corn hail damage. Photo credit: Dave Nicolai |
There is no option to replant corn at this calendar date - the cutoff has passed for planting grain corn on June 15th and planting silage corn on June 25th. Also, hold off on foliar fungicides for the sake of disease control. The corn diseases associated with hail damage are: common smut, Goss’s leaf blight and wilt, and possibly stalk rots - none of these diseases have proven effectively managed with foliar fungicide applications. Reference this Crop News article from Dean Malvick for more information on disease control in hailed corn. It can be tempting to take action immediately after a hail event, but return on investment must be carefully considered.
Soybean
A careful estimation of the remaining plant stand will be crucial for determining next steps. A final call on the existing stand should not be made until soybean regrowth can be carefully evaluated after a week or so. In the meantime, planning for potential management decisions may commence.
Soybean stands as low as 70,000 can produce near normal yields, so drastic mitigation strategies should be considered only in extreme cases. At this late date, spiking in additional soybeans will likely lead to a poor match in harvest maturity - leading to harvest challenges. A shift of one full maturity group earlier would be required to potentially match the full season variety.
A full replant of the soybean crop should be considered through the lens of future weed management. Farmers should consider existing weed pressure and the pre- and post-herbicide products already applied to the field. Farmers are often willing to give up some yield potential of maintaining an existing stand for better weed control by starting over with full tillage and a clean replant.
A recent publication on soybean planting dates in Minnesota shows that planting from the end of June through early July should result in yields of slightly greater than 50% of a normal early May planting date. This supports years of real-world experience by hundreds of farmers in southern Minnesota who regularly plant soybeans after canning peas. They often report 50-60% yields on soybean planted around July 1.
Again, as with corn, there is little value in treating hailed soybean with fungicides, so please save time, expense, and the active ingredients for better ROI situations.
Recent soybean hail damage. Photo credit: Taylor Herbert
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