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