There is one generation per year. Pinyon pitch nodule moth. Tree is disfigured and branches are weakened. Branch and twig dieback. Preventive trunk sprays when adults are active can reduce new attacks.
Thorough coverage is important, especially around active infestation sites.
Two to three treatments each season, repeated over at least two years, may be needed. Pyrethroids, Cygon and Dursban are among the most effective sprays. Needles change from green, to yellow to reddish brown. Promote tree vigor with proper watering, spacing and nutrients. Newly planted or stressed trees are highly susceptible.