Witches brooms on black spruce caused by Arceuthobium pusillum.
Witches broom on black spruce caused by Arceuthobium pusillum that was in the lab - without needles.
Black spruce showing loss of apical dominance and enlarged side branch that was infected with dwarf mistletoe.
Cortical strands and sinkers of dwarf mistletoe in cross section of conifer branch.
Male shoots of Arceuthobium pusillum.
Female shoots of Arceuthobium pusillum.
Seeds, produced in September, on Arceuthobium pusillum.
Basal cups of Arceuthobium pusillum.
Dwarf mistletoe, Arceuthobium americanum, on Jack pine from Manatoba, Canada.
Dwarf mistletoe on Ponderosa pine growing in northern Arizona.