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Several diseases and parasitic infestations cause untold damage to pinyon pines. Here are ways to help recognize and diagnose them.
Black Stain Root Disease (Leptographium wagneri) Black Stain Root Disease kills sapwood. The disease spreads through grafting and root contact with diseased trees. Also, insects can carry the spores of this disease up into the vascular system of the trees. This disease also creates primary routes for damaging insects to follow, further damaging the trees. Symptoms
Treatment
Dwarf Mistletoe (Arceuthobium divaricatum) More of a parasite than a disease, dwarf mistletoe is tiny parasitic plants, without leaves but with flowers. They grow on branches and are genus specific. In other words, they will infect only other pinyons. They kill trees by robbing them of water and nutrients, and they do it very slowly. This parasite can be green, greenish-brown or yellow. The shoots from the plant can range from a half inch to six inches long. Symptoms
Treatment
Armillary Root Disease (Armillary spp.) This fungal disease usually infects trees that are already infected by insects or by other diseases, or are stressed by other factors. It spreads along roots by fungal structures. Symptoms
Treatment
Related articles that may be of interest: Planting and Caring for Pinyon
The copyright of the article Major Pinyon Diseases in Desert/Water-wise Gardens is owned by Robert Dailey. Permission to republish Major Pinyon Diseases in print or online must be granted by the author in writing.
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