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The plant pathogenic fungus Leucostoma kunzei (formerly Valsa kunzei) is the causal agent of Leucostoma canker (also known as Cytospora canker or spruce canker), a disease of spruce trees found in the Northern Hemisphere, predominantly on Norway spruce (Picea abies) and Colorado blue spruce (Picea pungens).
When pruning choose roughly five to seven main branches and prune the rest. [19] Older trees need to be pruned more delicately – they are more susceptible to infections. [13] When pruning older trees, prune out dead, weak, diseased and insect-infested branches and also remove low, broken and crossing branches. [19] The quality of pruning has ...
The blue spruce is the state tree of Colorado. [67] It officially became Colorado's state tree on 7 March 1939 when House Joint Resolution 7 was enacted by the legislature. Previously a vote of the state's school children was taken on Arbor Day in 1892 expressing their preference for the blue spruce as the state tree. [68]
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 ...
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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.
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