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  • Author or Editor: C. Murren x
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Abstract

The croprotectants, polyvinylpyrolidone, glycerol, ethylene glycol and dimethyl sulfoxide were applied individually or in combination with each other in the form of a spray on whole apple (Malus domestica Borkh.) trees in the greenhouse and by terminal feeding apple and pear (Pyrus communis L.) trees in the field. The trees were tested both by artificial and natural freezing. The cryoprotectants increased cold resistance, however, different cultivars showed different effects with the various protective agents. Factors other than the colligative properties appeared to modify the effects of cryoprotectants.

Open Access