- Witches' brooms, a clump of small weak branches arising from
one point on a larger branch, form in infected trees - Needles
on brooms are pale green to yellow in summer - Needles die and
fall off in autumn, leaving a clump of bare branches in the
winter - Yellow to orange bumps form on needles within the
witches' broom, and may release powdery orange fungal spores in
summer - The branch at the base of the broom may be unusually
swollen or cracked - Also infects chickweed, causing orange
spots or blotches on leaves - More information on Broom rust...