engleski

The effect of cultivar and bearing tree on bud differentiation, frost damage and fruit set in apple

After severe winter frost, an examination was initiated of frost damage suffered by Idared and Golden Delicious clone B. The cultivars differed significantly in the diferentiation intensity, the share of damaged differentiated buds, but not in share of damaged undifferentiated buds. In both cultivars the bud damage was more intensive on long bearing wood than on spur, regardless of the differentiation grade. The interaction between the cultivar and the bearing wood was insignificant. The flower bud differentiation was better in Idared, but it also suffered a more frost damage than the Golden Delicious clone B with differentiated buds, but not than that with undifferentiated buds. In both cultivars frost damage increases with increase of differentiated flower buds (R2=0.759 ; P ≤ 0.001). The fruit set was within the limits of expectation only on the spurs of the Golden Delicious clone B, which showed strong tendency towards fruit set on long bearing shoots. In 2000, the yield of the cultivars was almost equal, as the result of thinning due to the frost damage on Idared.

Malus domestica Borkh; bud differentiation; winter frost damage; bearing shoot

nije evidentirano