Abstract
In this study, survival rates of pistils of seven apple (Malus x domestica Borkh.) varieties at various stages from tight cluster to full bloom on trees were determined after frost that occurred on the morning at 3:00-8:00 of April 17, 2004 when the temperature dropped to -4 to -6 o C in the orchard. The survival rates of pistils of varieties ranged between 36.7 and 96.5% at tight cluster, 6.2 and 86.0 % at first pink and, 0.2 and 52.0 % at full pink stages after frost injury. 'Starkspur Golden Delicious' (18.0 %), 'Granny Smith' (33.0 %) and 'Canada Reinette' (36.7 %) were the least damaged apple varieties at various flower buds stages from tight cluster to first bloom on trees after frost.
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