The pupae produce a silken, frothy, white covering within the gall. This stage lasts two to three weeks. Adults pull the pupal case out with them as they emerge. 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.