Spruce needles will gradually become mottled and discoloured.
Brown patches on foliage may be evident, with a notable needle drop during winter months.
There may be a dusting of black sooty mould that covers foliage and stems.
Spruce can recover, but it takes a bit of patience as regrowth is likely to be slow. You can help damaged trees by caring for them carefully by keeping them watered and feeding with fertiliser.
A black, sooty mould may be evident near the infested site.
A sticky, clear liquid may be evident near and around the area of infection.