How to Get Rid of Blights on a Magnolia Tree

Examine the branches and foliage of the magnolia closely, using a ladder if needed. Locate any areas that have gray mold growing on them and remove them. Pull off the infected foliage and prune off heavily infected limbs using a pruning saw, cutting them 1/4 inch from the trunk. Place all infected material into a trash bag and throw it away.

Rake the ground under the magnolia tree thoroughly to remove all loose material such as fallen leaves, seed heads, pine straw and mulch. Place all of the material into a trash bag and throw it away as well. These materials harbor the bacteria which can reinfect the magnolia later.

Open up a garden sprayer and fill it with a fungicide designed for ornamental trees and that specifies it treats blight. Use the recommended amount of product and dilute with water as directed by the package. If the magnolia tree is in bloom, use one-half to one-third the amount of fungicide dosage recommended to prevent damage to the blooms.

Spray all portions of the magnolia tree with the fungicide to cover it completely. Repeat the fungicide spray every five to seven days during periods of high humidity or rain. Apply it every seven to 10 days during normal to dry weather conditions.