Dr. Terence Robinson, Cornell-AgriTech, Geneva, New York For mildly biennial varieties, apply four sprays of Ethrel (1 pt/A) or NAA (4 oz/A) beginning when fruits are 25 mm in diameter and on a 10-day interval. For strongly biennialvarieties, apply four sprays of Ethrel or NAA (4 oz/A) beginning when fruits are 16 mm in diameter and on a Read More…