3 part question: 1. What is causing our short needle evergreen tree to loose it's needles? 2. What treatment do we use to eradicate the problem? 3. How do we prevent it? The needle loss has been occurring for about 5 years and is working it's way up the tree. I don't see evidence of insect infestation, fungus or disease. Despite the yearly needle loss that is creeping up the tree, it is still has new growth. Now we notice the needles loss on our blue spruce and 3 other evergreen trees.