Water and fertilize trees regularly. Nitrogen fertilization may increase the tree's tolerance or resistance to anthracnose, but avoid overfertilization. Chemical sprays normally are not necessary to control anthracnose except on those trees that have had a history of the problem. Several fungicides are labeled for anthracnose diseases including thiophanate and Bordeaux or other coppers. Thorough coverage and proper timing of the sprays are essential for adequate control.
Early sprays are critical for control.
Sycamore trees are often much too large to be effectively sprayed with anything other than commercial sprayers. Consult extension publication C-674, Tree Diseases in Kansas , for more information. Injections should be done by trained arborists as specialized equipment and training are required. Tree injection should only be attempted by a professional arborist or by someone who is familiar with tree anatomy and injection techniques. Anthracnose Diseases of Shade Trees.