western pine gall rust

Pine-pine gall rust, also known as western gall rust, is a fungal disease of pine trees. This plant disease is caused by "Endocronartium harknessii", an autoecious, endocyclic, rust fungus that grows in the vascular cambium of the host. Pine-pine gall rust is found on pine trees with two or three needles such as ponderosa pine, jack pine, and scots pine. The disease is very similar to pine-oak gall rust, but its second host is another "Pinus" species. The fungal infection results in gall formation.. more