Vineyard cover crops of oats and barley are also attractive to this pest. Remove dried grape clusters on vines, and disc weeds and clusters on the ground. Do this work at least a month before shoots begin to develop in spring. Harvest as early as possible. Damage can often be prevented by harvesting as early as possible.
Check varieties with compact clusters, developing shoots, flowers, or fruit clusters.
Treatment thresholds have not been established for this pest, but if the infestation is severe, treatments may be necessary. If the infestation is not widespread, spot treatments can be used. Pheromone traps for this pest are available and are useful in timing flights and subsequent treatments in the Salinas Valley. Place pheromone traps in the vineyard by December. Low-trap catches at the end of January to early February represent the beginning of adult emergence, which will give rise to the first generation.