Other drought symptoms include wilting and yellowing of leaves and twig dieback. One of the most common maple tree diseases is known as maple wilt. it had more dead than live limbs. Cracks on Trunks. what is this? My Maple tree is dying at the top the lower branches have spots like a round fungus on them. Acer macrophyllum, the tree’s Latin name, translates as “maple large leaf.” The leaves are the biggest in the maple world, reaching a foot in width. This fungus looks very similar to a maple tree root disease called collar rot, but with collar rot, the bark typically does not fall away from the base of the tree. You can combat drought by thoroughly watering trees and mulching to retain moisture. The fungi that cause verticillium wilt affect the tree's vascular system and causes symptoms of wilting and yellowing leaves that are concentrated in one particular area. There are several damaging maple tree diseases and pests. Acer macrophyllum, the tree’s Latin name, translates as “maple large leaf.” The leaves are the biggest in the maple world, reaching a foot in width. Signs of Decay. Signs of decay like the growth of mushrooms or fungi on the surface of the tree are a telltale sign that the tree is dying. I had a younger one in the back yard with the same symptoms. If your Japanese maple suddenly has a large branch, or a pretty big section of the tree that appears to suddenly just up and die. Basal canker – This maple fungus attacks the base of the tree and rots away the bark and wood beneath. This infection starts in the root system and works its way up the maple tree, resulting in cankers and dieback. Some of the most common are: Verticillium Wilt – Also called maple wilt, this fungus is a common and serious problem that can kill trees. More than likely it’s Verticillium Wilt. The causal factors are Verticillium albo-atrum or Verticillium dahliae, which are fungi found in the soil.This is a common and serious problem that can even kill established trees. the tree is about 20 years old. Maple Wilt. Unlike the branches of healthy trees, a dying tree's branches lack elasticity and do not bend. Preventing Maple Tree Diseases & Pests. Treatment for declining urban maples includes: watering, fertilizing, pruning dead branches, … we cut it down . Trees that suffer from drought typically die from the top down and from the outer branches in. While maple trees can suffer from a number of general problems, verticillium wilt seems to be the most common and dangerous disease plaguing maple tree owners. It usually starts with some discolored leaves, then the leaves turn brown and crispy and often will not drop from the tree right away. Maple wilt seems to be most common in Norway maples but is also found in silver, sugar, red, sycamore and Japanese maples. 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