Skip to Main navigation Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

Extension is almost done building a new website! Please take a sneak peek or read about our redesign process.

Extension > Garden > Diagnose a problem > What's wrong with my plant? > Evergreen Trees and Shrubs > Fir > Dense clusters of twigs

Print Icon Email Icon Share Icon

Fir > Trunk/Branches > Dense clusters of twigs

1 of 1
  • Broom rust 1
  • Broom rust 2
  • Broom rust 3

Broom rust
Melampsorella caryophyllacearum

  • 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

Don't see what you're looking for?

  • © Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy