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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Evergreen > Larch / Tamarack > Witches’ broom/Rounded clump of twigs

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Larch / Tamarack > Witches’ broom/Rounded clump of small twigs

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  • Image: Eastern spruce dwarf mistletoe 1
  • Image: Eastern spruce dwarf mistletoe 2
  • Image: Eastern spruce dwarf mistletoe 3

Eastern dwarf mistletoe
Arceuthobium pusillum

  • Witches’ brooms, a clump of small weak branches arising from one point on a larger branch, form in infected trees
  • Needles within the witches’ broom remain green, needles on the rest of the tree yellow and fall off, typically from the top of the tree down
  • Short (1/2 to 1 inch) brown to orange dwarf mistletoe stalks can be seen during the growing season but fall off after seed dispersal in August or September; this occurs only after 4 to 5 years of infection
  • Common only on tamarack near infected black spruce in northern Minnesota
  • More information on Eastern dwarf mistletoe...

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