If you want to cure tree diseases, you will need some serious time and patience. While many tree diseases are not that difficult to treat and control, because trees are so large you will need to dedicate time and energy to making sure that the treatment is working effectively. Knowing how to spot the signs of disease and the proper response to these signs is important if you want to cure tree diseases.
Remove affected foliage from the tree. This includes leaves with brown, black, yellow or purple spots, as well as distorted and deformed twigs and branches. Wipe your clippers with rubbing alcohol after each cut to avoid spreading infection, and dispose of all plant debris in sealed plastic bags. You may need to repeat this step several times before you get all infected foliage.
Remove all plant materials from underneath the tree. This will lessen the likelihood of reinfection from fungal diseases. Place all these remnants in a sealed plastic bag as well.
Prune the tree itself and trees around it. Many times infections are exacerbated if the tree does not get enough sunlight or adequate air circulation. Make sure that light can reach the center of the tree and that other trees and plants around the tree are not growing so closely that they block light out and trap moisture in.
Water using a drip hose. This will prevent fungal reinfection and keep leaves and branches dry. Only water in the early morning.
Fumigate the soil around the tree. This is only necessary if you suspect root rot. Check with a local professional before fumigating since not all soil-based fungicides are legal in all areas.