Morphologic differentiation of flower buds and development of dead flowersin autumn and winter 1998/99; flowering and fruitset 1999 in the sourcherry cv. 'Stevnsbaer' on four rootstocks.

摘要

In sour cherry cv. 'Stevnsbaer' 4 rootstocks were monitored for differentiation of flower buds and development of dead flowers in autumn and winter 1998/99. Rootstocks included were Colt, Weiroot 10, F12/1 and Gisela 5. No differences in morphological differentiation of flower buds during autumn and winter were demonstrated among the rootstocks. On March 15(th), 68,9-82,1% of the flowers were found to be damaged or dead and no significant differences between rootstocks were found. However, a significant difference in flower stage between Colt and Weiroot 10 was established on March 15(th) It is indicated that the most developed flowers in Colt die during winter probably because of frost. It is suggested that flower quality expressed as percent damaged/dead flowers and dead flower buds and fruitset are linked to flower bud quality in March. Flowers on Weiroot 10 were more differentiated than flowers on Colt on March 15(th). A clear difference in flower quality is demonstrated in the flowering period. Colt had a poor flower bud and flower quality seen as a high percentage of dead flowers and flower buds and a detrimental fruit set of 4,9 %. Gisela 5 had a poor flower bud and flower quality and the fruitset was 10,3 %. F12/1 and Weiroot 10 showed to have the best quality of flower buds and flower and the fruitset was respectively 23,2 % and 15,7 %.