Maple problem

Every year this maple in my garden suffers this fungi attack, no amount of spraying with chemical or natural remedies has any effect in preventing it. The tree is about 15 years old and about 3m tall, any clues as to what is causing it or how to prevent it?
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Mulching after a good spell of rain will also help retain that moisture. If you're in an area of lower, or sporadic, rainfall, thoroughly soak with a hose, or buckets, for a few days before applying.