Stern, R.A., MIGAL, Galilee Technology Center, P.O. Box 831, Kiryat-Shmona 11016, Israel
Flaishman, M., Institute of Horticulture, ARO, The Volcani Center, P.O. Box 6, Bet-Dagan, 50250, Israel
Applebaum, S., Kibbutz Ortal, Golan Heights 12430, Israel
Ben-Arie, R., Fruit Storage Research Laboratory, Kiryat-Shmona 10200, Israel

The main cherry cultivar grown in the warm climate of Israel, 'Bing', produces relatively small fruit. Over three consecutive years (2003-2005), application of 50 mg l-1 2,4-dichlorophenoxypropionic acid [2,4-DP; as its butoxyethyl ester (Power™)], 10 mg l-1 3,5,6-trichloro-2-pyridyloxyacetic acid [3,5,6-TPA; as the free acid (Maxim®)], or 25 mg l-1 2,4-dichlorophenoxyacetic acid (2,4-D) plus 30 mg l-1 naphthaleneacetic acid (NAA; 0.3% Amigo™), at the beginning of pit-hardening when fruitlet diameter was ca. 13 mm caused appreciable and significant increases in fruit size and total yield, except when the crop load was heavy. Anatomical studies revealed that the main effect of these synthetic auxins was via direct stimulation of fruit cell enlargement. The above auxins had no negative effect on fruit quality, either at harvest or after 1 month of storage at 0 °C, or on return yield in the following year. © 2007 Elsevier B.V. All rights reserved.