How to Get Rid of Black Mildew on Trees
Black mildew, sometimes called sooty mold, is caused by a group of fungi called ascomycetes. While black mildew does not usually kill a tree, a heavy infection can significantly stunt its growth, and the effects of black mildew---known as blight---are unsightly. The needles of an infected coniferous tree turn red one year and tan the next, eventually dying. They may or may not fall off the tree. The leaves of deciduous trees develop sooty black spots and drop off prematurely. Does this Spark an idea?
Instructions
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Mix water with a few drops of any liquid soap, and place in a pressure sprayer. Then, spray the tree, washing away as much of the mold as possible.
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Inspect your tree for insect activity and honeydew. Black mildew is caused by the secretion of honeydew, a sticky substance that many insects leave on the leaves and branches of trees. The spores of the fungi stick to the honeydew and quickly reproduce. Look for holes in the leaves and a sticky, clear substance.
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Identify the insects infesting your tree. They could be tiny mites, large chewing or boring beetles, or aphids, gnats, and other bugs. Look under the leaves or needles, along the branches and under the bark. Give a description of the insect(s) you found on your tree to someone at your local garden center, who will be able to help you choose an appropriate insecticide.
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Spray your tree with the insecticide, taking care to protect your skin and eyes. Follow the directions on the container and choose a calm day so the insecticide does not blow back at you or on other plants or nearby pets.
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Continue to monitor your tree for heavy insect activity and treat as needed.
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