We are back with our series on the common tree diseases and insect pests in Illinois with a closer look at a dangerous fungal disease, verticillium wilt.  Verticillium wilt is known to affect more than 350 species of flowering plants including shrubs, trees, fruits, and vegetables.  This disease affects the xylem, or tissue responsible for the movement of water within the tree, which makes it difficult for water to get to the branches.  As a...