The Horrid F Word: Frost
Erika DeBrouwer, Tree Fruit Specialist, OMAFRA
Some recent concerns about temperature drops have popped up in conversation with growers across the province. This “hot” topic is an opportunity to review critical temperatures, frost mitigation strategies and frost damage assessments.
Critical Temperatures
Apples | Silver Tip | Green Tip | ½ inch Green | Tight Cluster | First Pink | Full Pink | First Bloom | Full Bloom | Post Bloom |
Old temp | -8.9 | -8.9 | -5.6 | -2.8 | -2.8 | -2.2 | -2.2 | -1.7 | -1.7 |
10% kill | -9.4 | -7.8 | -5.0 | -2.8 | -2.2 | -2.2 | -2.2 | -2.2 | -2.2 |
90% kill | -16.7 | -12.2 | -9.4 | -6.1 | -4.4 | -3.9 | -3.9 | -3.9 | -3.9 |
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