Spruce
Picea
A spruce is a tree of the genus Picea (/paɪˈsiː.ə/ py-SEE-ə), a genus of about 40 species of coniferous evergreen trees in the family Pinaceae, found in the northern temperate and boreal (taiga) regions of the Northern hemisphere. Picea is the sole genus in the subfamily Piceoideae. Spruces are large trees, from about 20 to 60 m (about 60–200 ft) tall when mature, and have whorled branches and conical form.
Spruces can be distinguished from other genera of the family Pinaceae by their needles (leaves), which are four-sided and attached singly to small persistent peg-like structures (pulvini or sterigmata) on the branches, and by their cones (without any protruding bracts), which hang downwards after they are pollinated. The needles are shed when 4–10 years old, leaving the branches rough with the retained pegs. In other similar genera, the branches are fairly smooth.
Diseases Affecting Spruce
Insects Affecting Spruce
Spruce Bud Scale
Spruce bud scale may often go unnoticed since their size and color can cause them to be mistaken for buds. They are round, reddish brown in color and are often clustered in-groups of three to eight at the base of new shoots. Lower branches are more often attacked than higher branches. Severe infestations can produce…
Affected Species:
Spruce Spider Mite
The Spruce Spider Mite is considered one of the most destructive spider mites in the United States.
Affected Species:
Bagworms
Bagworm is a caterpillar that molts into a moth in the adult stage. They are easiest to identify by the bags they construct as they feed. Damage includes needle discoloration and injury.
Affected Species:
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