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  2. Leucostoma kunzei - Wikipedia

    en.wikipedia.org/wiki/Leucostoma_kunzei

    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).

  3. Blue spruce - Wikipedia

    en.wikipedia.org/wiki/Blue_spruce

    The blue spruce (Picea pungens), also commonly known as Colorado spruce or Colorado blue spruce, is a species of spruce tree native to North America in Arizona, Colorado, Idaho, New Mexico, Utah and Wyoming. [4] It is noted for its blue-green colored needles, and has therefore been used as an ornamental tree in many places far beyond its native ...

  4. Dendroctonus rufipennis - Wikipedia

    en.wikipedia.org/wiki/Dendroctonus_rufipennis

    The spruce beetle is the most serious pest of mature and overmature interior spruce in British Columbia; [8] small-diameter, rapidly growing trees were least susceptible to attack or death from spruce beetle, and the greater susceptibility of large-diameter, slowly-growing trees was more closely related to recent radial growth than to diameter. [9]

  5. Spruce broom rust - Wikipedia

    en.wikipedia.org/wiki/Spruce_broom_rust

    Spruce broom rust or yellow witches' broom rust is a fungal plant disease caused by the basidiomycete fungus known as Chrysomyxa arctostaphyli.It occurs exclusively in North America, with the most concentrated outbreaks occurring in northern Arizona and southern Colorado on blue and Engelmann spruce, as well as in Alaska on black and white spruce. [2]

  6. Blue stain fungi - Wikipedia

    en.wikipedia.org/wiki/Blue_stain_fungi

    Blue stain fungi (also known as sap stain fungi) is a vague term including various fungi that cause dark staining in sapwood. [1] The staining is most often blue, but could also be grey or black. Because the grouping is based solely on symptomatics, it is not a monophyletic grouping.

  7. 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.

  8. Spruce sawflies - Wikipedia

    en.wikipedia.org/wiki/Spruce_sawflies

    The yellow-headed spruce sawfly, Pikonema alaskensis, is widely known in the northern United States and Canada as a destructive pest of spruce. [1] It attacks white, black, Norway, and Colorado blue spruces. The larvae at first prefer new foliage, but after becoming about half-grown, old needles are included in their diet too.

  9. Inosculation - Wikipedia

    en.wikipedia.org/wiki/Inosculation

    Two trees may grow to their mature size adjacent to each other and seemingly grow together or conjoin, demonstrating inosculation. These may be of the same species or even of different genera or families, depending on whether the two trees have become truly grafted together (once the cambium of two trees touches, they self-graft and grow together).