Trees are different from branch to limb, but all of them have ways to stop fungal invaders dead in their tracks.
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Images
https://www.gettyimages.com/detail/photo/mt-kilimanjaro-elephant-herd-tanzania-kenya-africa-royalty-free-image/1227486177?phrase=elephants&adppopup=true
https://www.gettyimages.com/detail/photo/tree-knot-royalty-free-image/1421359043?phrase=tree%20knot%20hole&adppopup=true
https://commons.wikimedia.org/wiki/File:Sequoias_trees_giants_burned_bark.jpg
https://www.gettyimages.com/detail/photo/closeup-of-steam-burn-on-mans-forearm-royalty-free-image/157526071?phrase=arm%20scab&adppopup=true
https://www.gettyimages.com/detail/photo/mushroom-laetiporus-sulphureus-commonly-known-as-royalty-free-image/1322414550?phrase=Laetiporus%20sulphureus%2C&adppopup=true
https://en.wikipedia.org/wiki/File:Carpinus_betulus1_cross_beentree.jpg#/media/File:Carpinus_betulus1_cross_beentree.jpg
https://en.wikipedia.org/wiki/File:Ficusxylem.jpg
https://en.wikipedia.org/wiki/File:Broussins_sur_un_cypr%C3%A8s.jpg
https://www.gettyimages.com/detail/photo/mushrooms-growing-out-of-dying-tree-royalty-free-image/1126815223?phrase=tree%20fungus&adppopup=true
https://www.gettyimages.com/detail/photo/old-gum-tree-trunk-with-scars-in-ormiston-gorge-royalty-free-image/1212456997?phrase=tree%20scar&adppopup=true
https://commons.wikimedia.org/wiki/File:Copper_European_Beech_Tree_at_Forest_Hills_Cemetery,_Jamaica_Plain-Boston,_MA_-_August_15,_2015.jpg
https://www.gettyimages.com/detail/illustration/anatomy-of-tree-trunk-royalty-free-illustration/1390435259?phrase=heartwood&adppopup=true
https://www.gettyimages.com/detail/photo/wild-mushrooms-at-autumn-in-forrest-royalty-free-image/625772270?phrase=log%20fungi&adppopup=true
https://www.gettyimages.com/detail/photo/hollow-in-a-large-tree-near-the-street-royalty-free-image/1396216404?phrase=tree%20hollowed%20trunk&adppopup=true
https://commons.wikimedia.org/wiki/File:Salix_x_sepulcralis_(aka).jpg#/media/File:Salix_x_sepulcralis_(aka).jpg
https://commons.wikimedia.org/wiki/File:Salicylic-acid-skeletal.svg#/media/File:Salicylic-acid-skeletal.svg