Dwarf mistletoe is a problem in Colorado forests. It is rarely transmitted through nursery stock, but can be difficult to manage in naturally forested areas of the Pikes Peak region.

Although some species, like juniper mistletoe (Phoradendron juniperinum) and piñon dwarf mistletoe (Arceuthobium divaricatum), have always been around.

Dwarf mistletoe is a common problem in Colorado forests on ponderosa and lodgepole pine. Douglas fir, pinon and limber pine also are affected to some extent by this same parasite.

It’s the dwarf mistletoes (Arceuthobium spp.) that are known for infesting many other conifers. These evergreen mistletoes are sneaky because they’re hidden year-round.

Pines infected with dwarf mistletoe develop swollen twigs and branches. The swelling is due to the development of roots of the parasitic mistletoe inside the infected twig or branch. The twig must ...

Mistletoe has a dark side because some species are bad for the environment. “It can harm and kill trees,” said Nicole Keleher, forest health director.

New England’s cold winters keep dwarf mistletoe from taking hold here, she said, but that could change. “I think about climate change and wonder when is the tipping point. It could be a ...

Dwarf mistletoe spreads by sticky pressurized seeds that, when burst, can spread upwards of 50 feet. The seeds then adhere to the surfaces of nearby trees (Texas A&M Forest Service).

Mistletoe can also be sticky, so it’s a good idea to bring gloves. And always keep mistletoe away from pets and children — it’s poisonous if eaten. Loading ...

By Kirsten Weir No kissing here White spruce with “witches’ brooms,” a tell-tale sign of mistletoe infection. Courtesy of Jaret Reblin For the white spruce tree (Picea glauca), mistletoe is the kiss ...

Mistletoe has a dark side because some species are bad for the environment. “It can harm and kill trees,” said Nicole Keleher, forest health director.