According to reports, the pistil part of the apple flower is the least resistant to freezing. When the flower is frozen, it first appears on the pistil. When the freezing injury is mild, the pistil is stunted, the stigma becomes shorter or twisted, and it cannot extend normally from the flower and is shorter than the filament. When freezing damage is severe, the pistil will die, and the stigma and ovary will be black when the flowers are peeled off. In general, the symptoms of flowers are not obvious on filaments, anthers, and flower differentiation.
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