Larvae reach a length of 12 mm, and have a pair of horn-like projections on the posterior end. Larvae winter in the cane, and in March create a pupal chamber. The pupa is formed in late April. The pupal period lasts 20-40 days. When the adult leaves the pupal skin, it remains in the tunnel for about 10 days before chewing a D-shaped emergence hole .
Adults feed on foliage for several days before beginning oviposition.
They are most easily found on the plants on warm sunny days. There is one generation annually. After leaf fall or during winter pruning, note galls. Examine primocanes for adults twice weekly, beginning at the beginning of bloom. Spray toward the base of canes, avoiding areas with any residual blooms.