Mistletoe has long been known as a holiday decoration and romantic tradition; if you walk under it, you share a kiss with whoever is nearby. However, this symbol of love ends when it comes to our trees.
Phoradendron tomentosum, the Mistletoe, is a parasitic plant that attaches itself to trees and shrubs. It is commonly found on oaks, pecans, elms and hackberries. It is considered parasitic because it robs the host plant of nutrients and water (the leafy mistletoe only takes water from its host plant). Over time, tree branches can weaken, and tree growth is inhibited. If left untouched, an infestation can eventually kill the tree. It is also poisonous to humans, dogs, cats and horses, although birds and some animals depend on the berries as a food supply.
The leafy mistletoe is spread through birds. They will eat the berries, which are sticky. The berries make their way through the birds’ body and are eventually expelled in droppings that land on branches. The berries can also be transferred to branches by sticking to the bird’s legs and getting rubbed off. The seed germinates on the tree’s bark and within a couple of years, it has developed a root system. Then, a new mistletoe plant emerges.
Most mistletoe plants reach 12 to 18 inches in diameter. It has small, round leaves, thick stems and, in the winter, white berries. Often a bulge developed where the plant is attached to a branch. Spotting mistletoe plants in deciduous trees is simple in the winter. Mistletoe is evergreen. When a tree loses its leaves in the winter, the mistletoe will stand out as a bushy green growth on a branch.
The most effective management treatment for mistletoe is removal. The branch with growth should be pruned 12 or more inches below the attachment point. In this way, the entire root system is excised. Snipping off only the green mistletoe growth will enable the parasite plant to grow back stronger.
by Teresa Brown, ECMG
Sources:
Texas A&M AgriLife Extension. (n.d.) Mistletoe. https://plantclinic.tamu.edu/calendar2018/mistletoe
The Ultimate Guide: A Monthly Gardener’s Companion. (2024). IPM Note. Mistletoe—the kissing plant.
[Source for the photos: Texas A&M AgriLife Extension. (n.d.) Mistletoe. https://plantclinic.tamu.edu/calendar2018/mistletoe]






















