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They are either bacteria or bugs.

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Q: What are the brown spots on the leaves of a Japanese maple?
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What kind of leafs are green with dark brown spots?

red maple leaves


How do you get rid of yellow spots on Japanese Red Maple?

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How do you get rid of the brown spots on leaves of a persimmon tree?

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What are the black spots on the leaves of the maple tree?

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What causes brown spots on Magnolia leaves?

Magnolias unlike many trees lose their leaves in the springtime. This year my magnolia started to drop leaves in the first week of May when the weather got warmer. black spots on the underside of the leaves can also be seen. Magnolias like lime free soil, so a lime free compost is best.