Sprays and dusts were applied at specific stages of flower and berry development. They were: 1) prebloom, more than 10 days before any bloom takes; 2) early bloom, when 5-10% of the calyptras have been shed from clusters in the vineyard; 3) full bloom, mhen 50-100% of the calyptras have been shed; 4) postbloom, when 100% of the calpytras have been shed and many of the flowers in the clusters were losing their stamens; and 5) smll pea size, when berries have lost their stamens and berry size was approximately 6-9 mm in diameter.