1. Canker
    dead sections of bark on branches or main trunks of trees. Bark may be killed by mechanical injuries or by plant pathogens, especially fungi and bacteria
  2. Conk
    Fungal Conks, or mushrooms growing from the trunk or base of a tree, are an indication that a rot- inducing pathogen has taken up residence
  3. Gall
    abnormal growths that occur on leaves, twigs, or branches. ... There are 1500 species of gall producers, the majority of which are insects and mites. Some galls form where insects or mites feed or lay eggs. They may also develop as a response to infections by several kinds of fungi, bacteria, and viruses.
  4. White rot
    White-rot fungi break down the lignin in wood, leaving the lighter-colored cellulose behind; some of them break down both lignin and cellulose. As a result, the wood changes texture, becoming moist, soft, spongy, or stringy; its colour becomes white or yellow.
  5. Brown rot
    destructive fungal disease of trees and shrubs in the genus Prunus which includes peaches, plum, cherries, apricots and nectarines. Brown rot is particularly a problem on the fruits of susceptible plants, with the potential to cause losses of 50% or more prior to harvest
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