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Lilacs The disease that causes brown spots on leaves is called leaf spot. In lilacs, several kinds of fungi may be responsible for causing leaf spot disease. These include members of the Cercospora spp., Macrophoma spp., Phyllosticta spp., and Pleospora spp. among others. The leaves of infected shrubs show brown or black spots. Spray plants with a copper fungicide 2 or 3 times, at weekly intervals. Prune and destroy severely diseased branches.
Creepers The spots often come together to form larger patches of dead tissue (blotches). Sometimes you will see flecks or black dots around the spots. These are the spore-bearing friotong bodies of the fungus. Pick off and discard the infected leaves, and spray the plants every 7 to 10 days with a flowable sulfur spray. Avoid wetting the foliage while watering your vines. Mulching around plants helps prevent fungi from being splashed up from the ground by rain or when you are watering.
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