There is oozing sap on the trunk of my pinyon trees. Should I be concerned?
Pinyon trees are naturally “sappy” trees. Just because you see sap does not mean you should be alarmed. However, there are a couple of insects that can cause sap to ooze from these trees that you might want to know about. Bark moths and pitch moths attack the trunk and larger branches. They cause large, ugly masses of pitch but usually dont do enough damage in one season to cause significant damage to the tree. However, repeated attacks can weaken trees and kill branches. No chemicals are registered to treat these insects. The only effective control is removing the larvae from the pitch mass with a knife or similar tool. See our Photo Gallery section for images of pitch moth activity and larva. Bark beetles, also called engraver beetles, attack ponderosa and pinyon pines as well as other conifers. These small beetles attack the tree (usually stressed or weakened trees) in large numbers and will effectively kill the tree in a relatively short time period. Trees will often produce sap no
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