The current 2017 wet/rainy weather and high humidity can create a situation where diseases can become an issue in corn. While there are several foliar diseases that can occur on corn under these conditions, gray leaf spot and northern corn leaf blight have been especially problematic over the last several years. Gray leaf spot and northern corn leaf blight can cause yield losses and the risk of infection may be an issue this year. What should a grower do about it? While applying protective fungicides is an option, there are several things to consider before spraying