XVI International Botanical Congess

Treatment of gibberellic acid during flower bud formation period influence flowering next spring. It is well known that exogenous gibberellic acid inhibit flowering of some fruit trees. We have observed that the flower formation of Japanese persimmon is also inhibited with exogenously applied GA3. The most effective application times that inhibit flower bud development are, however, had not been characterized in detail. Controlling flower bud formation is essential for glowers. Therefore, we examined when we should apply 500ppm GA3 in order to inhibit the flower bud formation of Japanese persimmon effectively.