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Blue spruce usually grows in cool and humid climatic zones where the annual precipitation mainly occurs in the summer. [29] Blue spruce is most common in Colorado and the Southwest. The annual average temperature ranges from 3.9 to 6.1 degrees C (39 to 43 degrees F). And ranges from - 3.9 to - 2.8 degrees C (25 to 27 degrees F) in January.
Southwestern white pine, white fir, ponderosa pine, and Colorado blue spruce are also found. Significant stands of aspen occur in the wilderness on historically disturbed sites in both the subalpine and montane zones. Aspen stands cover 27% of the wilderness.
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).
For example, Seattle, Washington, and the city of Austin, Texas, are both in the USDA hardiness zone 9a because the map is a measure of the coldest temperature a plant can handle.
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In 2006, the Arbor Day Foundation released an update of U.S. hardiness zones, using mostly the same data as the AHS. It revised hardiness zones, reflecting generally warmer recent temperatures in many parts of the country, and appeared similar to the AHS 2003 draft. The Foundation also did away with the more detailed a/b half-zone delineations. [6]
Rhizosphaera needle cast is a common fungal disease of Colorado blue spruce, which eventually kills mature trees. Once the foliage is removed, it will not regrow, even if sunlight now reaches the ...
According to the United States Department of Agriculture, the Plant Hardiness zone at Mesa Verde National Park Headquarters at 6952 ft (2119 m) elevation is 6b with an average annual extreme minimum temperature of −0.1 °F (−17.8 °C). [102]
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