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What Is This Orange Stuff on the Evergreen Tree?
What Is This Orange Stuff on the Evergreen Tree?. Various types of evergreen trees produce masses of orange growth. These trees suffer from a disease called fusiform gall rust. The fungal disease produces the orange growths in the spring.
Various types of evergreen trees produce masses of orange growth. These trees suffer from a disease called fusiform gall rust. The fungal disease produces the orange growths in the spring.
Description
Fusiform gall rust consists of masses of orange, powdery spores on swollen areas of branches and the trunk. The fungus primarily attacks loblolly and slash pines. Other types of evergreen trees, such as longleaf and shortleaf pines, remain resistant to the fungus.
Damage
If you see the orange galls on the main trunk of your evergreens, the fungus will likely kill the tree. The tree takes a few years to die, as the fungus destroys more of the woody tissue of the trunk each year.
Control
No fungicides save mature trees infested with fusiform galls. If the tree only has galls on branches growing 8 to 12 inches from the trunk, prune those branches to stop the fungus from reaching the trunk. Removing the tree remains the best option if the galls form on the trunk.
