Damage in early nectarine cultivars of cold winter
Keywords:
freezing of fruit buds; nectarine; winter frostsAbstract
In January 2016 we established negative air temperature (-22,5oC) which is a prerequisite for freezing of fruit buds of nectarine. The early cultivars Aureliogrand, Sunfree, Big top, Gergana, Weinberger, Nectagrand 4, Independence, Caldesi 2000 were tested on seminal (Elbert) and clonal (GF 677) rootstocks. The study also included peach cultivar Redhaven of seminal rootstock known for its cold tolerance. With high percentage of frozen fruit buds were all cultivars of rootstock GF 677. The relatively high percentage of frozen fruit buds are set on the upper part of the mixed branches (16,8 to 75,5%). Aureliogrand has a relatively smaller percentage of freezing buds then Redheaven and the other cultivars it exceeded.
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