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Northern Corn Leaf Blight. What to do?

We've received lots of questions on Northern Corn Leaf Blight in the past few weeks.  Here is some detailed information on the disease from Dr. Alison Robertson of Iowa State University. 
On susceptible hybrids, a foliar fungicide application at tasseling/silking is likely necessary. Farmers and agronomists are advised to scout fields, especially all fields planted to NCLB-susceptible hybrids. If the disease is present on 50 percent of the plants in the field (one or more lesions per plant) at tasseling, a fungicide application may be necessary to protect yield. Severe NCLB development during grain fill can result in yield losses of 30 percent of more.”

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