If your question is the latter, here's a lengthier article explaining leaf spot diseases. It is fungus disease that attacks most of the young magnolia trees. Raking up and disposing infected leaves may reduce leaf spots next year. Cankers on branches can be pruned out. Treatment for most diseases that effect the Magnolia involve simple pruning, fertilizing and watering. Rake up and dispose of infected leaves. Diseases. syringae also is often encountered as a leaf-spotting organism. Many of the leaf-spotting fungi survive … The soil should be saturated just to a 6-inch depth. Magnolias should be planted with enough distance between trees to allow for wind ventilation. have been found by the OSU Plant Clinic in leaf spots of magnolia. Diseases. Magnolias are a genus of flowering shrub or tree that produces vibrant flower growth when in bloom. Residual salts in the soil from excess fertilizer can affect roots and lead to spotting symptoms. Some questions aren't readily answerable unless one has access to the landscape in question. See: Magnolia-Bacterial Blight. Then disinfect your pruning tools by dipping them into a solution of hot water and household bleach. Cause The fungi Cladosporium sp., Coniothyrium sp., Phyllosticta magnoliae, and Septoria sp. White spots on magnolia leaves can be an indication of several diseases and pests that reduce the vitality of the blossoms and plant vigor. The magnolia tree is naturally resistant to many diseases that commonly infect trees. Canker diseases will kill branches. This disease is among the most common magnolia tree diseases. Pest infestations may cause mottled spotting. Canker diseases will kill branches. Magnolia scale is the most common insect problem and can be controlled with horticultural oil. It is characterized by thread like appearance on the underside of the leaf, the affected leaves appear to be matted and they stick together. Magnolia tree leaf diseases can typically be controlled with proper care. to the need for information on pruning. It is a disease of the xylem, or water-conducting tissues, in the plant. Brown spots and speckling on leaves may be due to incorrect pH and the lack, or overdose, of specific nutrients. The bacterium Pseudomonas syringae pv. Leaf Blight - Sometimes a leaf blight disease, caused by a fungus, covers magnolia leaf undersides with matted fungal threads. Verticillium wilt is a serious fungal disease that causes injury or death to many plants. Leaf blight. Commonly infected woody plants include maple, smoke-tree, catalpa, and magnolia, among others. A number of Leaf Spot diseases produce muted spots that resemble those of fungal rust. Magnolia may be subject to leaf spots, blights, scabs and black mildews caused by a large number of fungi, or a bacterium but they rarely require chemical controls. Leaf spots rarely require chemical controls. Leaves die early and hang matted together from the twigs for some time. Other fungal and bacterial diseases, like leaf spot, blight, scab and black mildew, hardly ever need chemical control, and the best treatment is to prune off affected branches and rake up and dispose of infected leaves. Algae can also cause leaf spots. Phyllosticta and Cladosporium were found most frequently. Magnolia may be subject to leaf spots caused by the bacterium Pseudomonas syringae or a large number of fungi. Prune out and destroy infected branches. Magnolia trees need to be watered only once a week or every other week during dry periods. Questions about magnolia care range from problems regarding specific plant parts (e.g., problems with the leaves, problems with the buds, etc.) Residual salts in the soil from excess fertilizer can affect roots and lead to spotting symptoms some questions are readily... 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