Ball moss is a harmless plant that grows on the surface of other things. Ball moss absorbs water and nitrogen from the atmosphere and is in no way parasitic.
Ball moss prefers shade and moisture. The perfect place for them to grow is under a tree. If a limb dies, it is because of lack of sunlight due to the ball moss growing in that space. Oak trees are good places for ball moss to grow.
Kocide, a copper hydroxide, can be sprayed on the tree. It works by drying out the ball moss. Regular pruning that includes the removal of dead or dying branches will significantly reduce the ball moss.
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