Hello, I live in the SF Bay Area in CA, and moved into a house last year. THe tangerine tree in our front yard has recently shown some signs of "bad stuff" Don't know if it's a lack of water, fertilizer, pests... I noticed some yellowing of leaves, "wilted" look to some branches (due to fruit weight?), and some inner parts of the tree branches becoming dead and leafless. Please see the pictures! Any help would be greatly appreciated!