Moss and lichens growing on your trees in the Pacific Northwest is not uncommon. They aren't usually harmful to trees, unless of course they become to too heavy-making the braches susceptible to wind damage. Most moss grows on older trees in conditions where the sunlight is diffused. One way to decrease its potential for growth is to allow for more direct sunlight around your fruit trees and pruning to create better air circulation. In regards to removing the moss, don't spray or you may damage the tree
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