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Update on Fungal Leaf Blights

July 14, 2000
Common rust is developing in most cornfields around the state. Eyespot is showing up on the upper leaves of corn plants in various areas around the state. Remember that what is important about all these leaf blights, including the rusts fungi, is not which blight you have but rather the percentage of leaf area blighted as a whole on the plant. Our recommendation is to scout the corn during the 2 weeks prior to tasseling through 2 weeks after tasseling. Control considerations may be justified when whole-plant infection reaches 15% for field corn and 10% for seed corn during this time. For control considerations and recommended fungicides, see issue nos. 14 and 15 of the Bulletin.--Loretta Ortiz-Ribbing

Author: Loretta Ortiz-Ribbing

The Pest Management and Crop Development Bulletin
Executive Editor: Kevin Steffey, Extension Entomologist

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