Flowering and vegetative growth of strawberry. II

Abstract

1. Influences of photoperiod, especially light break, given before or after flower bud differentiation, on the initiation and development of flower bud in strawberry were studied using variety Red Star.2. Flower bud differentiation was markedly delayed by long day treatments (15_??_161/2 hours and 24 hours) or a fairly long light break (8+3 hours) given before the differentiation (September 1). Effect of light break could hardly be seen when it was short (7+1/2 hours).3. Light break of 8+3 hours was nearly as effective as the 15_??_161/2 hour long day treatment in terms of the delaying effect on flower bud initiation.4. Increase in foliar length and the number of runners was observed in plants given long day or three-hour light break.