A lush, green lawn is one of the best parts of summer, but warm temperatures and high humidity can also create the perfect conditions for brown patch disease. If you've noticed large brown circles suddenly appearing in your yard, you're not alone. Brown patch is one of the most common lawn diseases in Indiana, especially during the hot, humid months. What Is Brown Patch Disease? Brown patch is a fungal disease caused by Rhizoctonia solani. It primarily affects cool-season gra