Why are my blue spruce trees dying?

Why are my blue spruce trees dying?

Why are my blue spruce trees dying?

Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. The disease, referred to as Rhizosphaera needle cast, is the most common problem seen on blue spruce samples that are submitted to the Plant Disease Clinic. ... In general, trees appear to die from the bottom upward.

How do you treat a sick blue spruce?

Fungicides with the active ingredient chlorothalonil, copper hydroxide or mancozeb will protect new spruce needles from infection by Rhizosphaera.

  1. Make one application in spring or early summer when the new needles have grown to half their mature length.
  2. Make a second application 3 to 4 weeks later.

How long does it take for a blue spruce tree to die?

It can take up to 15 months for the needles to show visible symptoms after the initial infection. Young trees may be killed by this disease, but usually branches die off after 3-4 consecutive years of defoliation, causing trees to look disfigured.

What kind of disease does a blue spruce have?

Answer: Thank you for contacting us regarding your tree issues. Rhizosphaera needle cast (Rhizosphaera kalkhoffii) is a foliar disease of spruce trees. It is most common in trees growing outside of their native range. It starts on the inner and lower growth and progresses upward through the tree.

Why are the needles falling off my blue spruce?

The first sign of trouble is the browning of needles on the lower branches, which gradually spreads upwards. Eventually, the whole tree drops its needles and dies. This is due to a combination of factors, and unfortunately, there is little that can be done to save them.

Why are the lower branches on my spruce dying?

There could be several reasons for the lower branches dying on your spruce. If the upper branches provide too much shade, the lower branches naturally die off. Also, several diseases can contribute to branch dieback. Cytospora canker is a fungus that attacks spruces and causes branch death.

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