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2. Dibotryon morbosum - Wikipedia

   en.wikipedia.org/wiki/Dibotryon_morbosum

   Dibotryon morbosum or Apiosporina morbosa is a plant pathogen, which is the causal agent of black knot. [1] [2] It affects members of the Prunus genus such as; cherry, plum, apricot, and chokecherry trees in North America. The disease produces rough, black growths that encircle and kill the infested parts, and provide habitat for insects.

3. Slime flux - Wikipedia

   en.wikipedia.org/wiki/Slime_flux

   Slime flux, also known as bacterial slime or bacterial wetwood, is a bacterial disease of certain trees, primarily elm, cottonwood, poplar, boxelder, ash, aspen, fruitless mulberry and oak. A wound to the bark, caused by pruning, insects, poor branch angles or natural cracks and splits, causes sap to ooze from the wound. Bacteria may infect ...

4. Fraxinus nigra - Wikipedia

   en.wikipedia.org/wiki/Fraxinus_nigra

   Tree bark is corky and spongy. Black ash is a medium-sized deciduous tree reaching 15–20 metres (49–66 ft) (exceptionally 26 metres (85 ft)) tall with a trunk up to 60 cm (24 inches) diameter, or exceptionally to 160 cm (63 inches). The bark is grey, thick and corky even on young trees, becoming scaly and fissured with age. The winter buds ...

5. Epicormic shoot - Wikipedia

   en.wikipedia.org/wiki/Epicormic_shoot

   Similarly, ash trees may develop epicormic shoots when infested by the emerald ash borer. [9] Epicormic shoots can be used in mass propagation of oak trees. [10] The long-lived Pseudotsuga macrocarpa (bigcone Douglas fir) forms epicormic shoots both in response to fire damage and as a means of forming growth on existing branches. The epicormic ...

6. Burl - Wikipedia

   en.wikipedia.org/wiki/Burl

   Burrs on a tree trunk in Norfolk, England. A burl (American English) or burr (British English) is a tree growth in which the grain has grown in a deformed manner. It is commonly found in the form of a rounded outgrowth on a tree trunk or branch that is filled with small knots from dormant buds. Burl formation is typically a result of some form ...

7. Heart rot - Wikipedia

   en.wikipedia.org/wiki/Heart_rot

   The bracket fungus Fistulina hepatica is one of many that cause heart rot.. Heart rot is caused by fungi entering the trunk of the tree through wounds in the bark.These wounds are areas of the tree where bare wood is exposed and usually, a result of improper pruning, fire damage, dead branches, insects, or even animal damage.