Volume 41 Number 3 Article 9 Pages: 105-110
Year 1987 Month 7
Title: Freeze Susceptibility to Fruit Buds of Selected Apple Cultivars in East-Central Ontario, 1986
Author: J. Warner
Citation
Abstract:
Freeze damage to apple fruit buds was assessed at the Smithfield Experimental Farm
and in 14 commercial orchards in east-central
Ontario following spring frosts in 1986, of -4.5°C
at the 13 mm green stage and -4.0°C at the pink
stage of bud development.
Apple cultivars differed in bud hardiness during the two frosts.
'Idared' had the least amount of bud injury
during the first frost but did not differ from
'Mclntosh' during the second frost. 'Delicious'
buds had more freeze injury than 'Mclntosh'
during the second frost but there was no difference in bud hardiness between the two cultivars
during the first frost.
Bud injury during both
frosts was greater than expected based on previously reported critical temperature threshold
values.
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