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