The gentle spruce tree ( genus Picea pungens ) is also referred to as Colorado puritanical spruce or silver grey spruce and is chiefly aboriginal to the western U.S. and the Rocky Mountains . An first-class shelterbelt tree , the blue spruce is susceptible to fungous diseases that cause its needle to reverse brown or red and prematurely fall .
Step 1
A lack of moisture is the principal suspect when the blue spruce tree commence suffer its needles . The first symptom of water focus is the browning of the needles followed by their dropping to the ground . In addition to summertime drought , a succession of three wry winters will damage the needle . extra water should be applied to the soil surround the puritanical spruce during the wintertime month . The Sir Herbert Beerbohm Tree is not well - conform to high heat or dry wind .
Needle Cast Disease
If a blue spruce is turning violent and losing its needles , it likely is confront an onslaught of needle cast disease due to the fungus Rhizosphaera kalkhoffii . This disease most often outpouring to life story in wet , warm weather when the temperature cast from 65 to 75 degrees Fahrenheit , with the fungal spores circularize easily through warm rain . It get the needle of the spruce to take on a blood-red - purple , brown or scandalmongering tint before they come from the tree .
Step 2
Needle Cast Management
Black , fruit bodies of the fungus will also form on infected needles . The reddish color on the needles of the dispirited spruce will typically occur in August followed by a Robert Browning and then drop of the needles . If the branches are completely defoliated for a span of four to five years , the stress may eventually kill the tree diagram . Fallen needles should be skim and discarded . antifungal agent are available to control this disease .
Spruce Needle Rust
Spruce acerate leaf rust fungus , triggered by several dissimilar fungal coinage of the genus Chrysomyxa , is so name for the red , pink or orangish colouring the disease displays on the needle of the blue spruce . The disease first appears as a yellowing of current class needle near the tips of the branches , followed by the development of scarlet - orange or white projection on the needles . These maturation serve as the reproductive center of the fungus and unfreeze orange or red-faced spores into the air current .
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