Northern Corn Leaf Blight (Exserohilum turcicum)
Northern corn leaf blight (NCLB), caused by the fungus Exserohilum turcicum previously called Helmithosporium turcicum, can cause yield losses in humid areas where corn is grown. In moderate humid climate the disease can occur everywhere, but usually does not appear in fields before silking. This disease rarely causes significant yield losses during dry weather, but during wet weather periods it may result in losses of over 30%, especially when established on the upper leaves at the silking stage of maize development. If leaf damage is only moderate or is delayed to about 6 weeks after silking, yield losses are mostly minimal. Northern corn leaf blight also predisposes corn to stalk rot by increasing stress on the plants.