I have a spruce tree that has a problem. Every year, some branches suddenly drop all of their green needles and die. I would like to prevent this, but I don't know what the cause is. What causes this and how do I prevent it?
RUST vesicular OF NEEDLES (Chrisomyxa spp.)
Symptoms: Yellowing of needles younger during the summer, for a portion or in their entirety. Subsequently emerge from the needles attached vesicles elongated, finger-like white or orange to rust, which would break with ease emitting abundant spores. Following the loss of the needles.
PREVENTION: If the vesicles are white, the spores can infect rhododendrons, resulting in the appearance of typical rust, and then ritoornare to infect the fir. Provide deleting or moving the rhododendrons from the immediate vicinity of the plants fir attacked.
CARE: Remove infected branches, dealing with specific products only in case of massive infestation.