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Samples of current season shoots of Anjou, Bartlett and Bosc pears were collected throughout the year during 1990, `91 and `92. Differential thermal analysis (DTA) and vital staining with triphenyltetrazolium chloride (TTC) were used at the sampling times to determine freeze resistance. Freezing tests were conducted on greenhouse-grown trees. Temperatures to freeze the trees were predetermined by DTA. After freezing TTC staining, acid fuchsin test and growth were used to determine survival. All three varieties began to acclimate after terminal growth ceased in late June until October. Bartlett and Anjou obtained about -25°C resistance by this time and Bose about -23°C. After frost began, Anjou and Bartlett gained an additional resistance to -33°C and Bose to -28°C. Trees frozen artificially at -27°C had limited growth but did leaf out only to die a month later. Trees frozen at -33°C never leafed out Bartlett trees at -27°C looked better than Anjou and Bose trees but died also.

553 PB342 COLD RESISTANCE OF `ANJOU', `BARTLETT' AND `BOSC' PEAR TREES