The UVM Apple Program:
Extension and Research for the commercial tree fruit grower in Vermont and beyond...
The UVM Apple Team
Dr. Lorraine Berkett, Terence Bradshaw, Sarah Kingsley-Richards, Morgan Cromwell
2011 Apple Bud Stages at the UVM Horticulture Research Center
South Burlington, VT Elevation 71 m above sea level
2011 Apple Bud Stage for Selected Cultivars |
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| Date | Degree Days base 50°F1 from Jan 1 | Ginger Gold | Honeycrisp | Liberty | Macoun | Zestar! | McIntosh |
| 4/6 | 0 | Dormant | Dormant | Dormant | Dormant | Dormant | Dormant |
| 4/11 | 7 | Silver Tip | Dormant | Dormant | Silver Tip | Silver Tip | Silver Tip |
| 4/20 | 13 | Green Tip | Dormant | Silver Tip | Silver Tip | Green Tip | Late Silver Tip Green Tip (4/22) |
| 4/25 | 15 | 1/4" Green Tip | Green Tip | Green Tip | Green Tip | 1/4" Green Tip | Green Tip |
| 4/28 | - | 1/2" Green Tip - Early Tight Cluster | 1/4" Green Tip | 1/2" Green Tip | 1/4" Green Tip | Tight Cluster | 1/2" Green Tip |
| 5/1 | 39 | Tight Cluster | 1/2" Green Tip | Tight Cluster | 1/2" Green Tip | Tight Cluster | Tight Cluster |
| 5/9 | 62 | Pink | Early Pink | Early Pink | Open Cluster | Pink | Pink |
| 5/13 | - | King Bloom | Pink | King Bloom | Pink | King Bloom | Late Pink |
| 5/15 | 100 | Full Bloom | King Bloom | Full Bloom | King Bloom | Full Bloom | King Bloom Full Bloom (5/17) |
| 5/22 | 140 | 95% Petal Fall | 10% Petal Fall | 95% Petal Fall | 50% Petal Fall | 75% Petal Fall | 75% Petal Fall |
| 5/25 | 180 | Petal Fall | Petal Fall | Petal Fall | Petal Fall | Petal Fall | Petal Fall |
Click here to
read criteria for determining bud stages1 Weather data collected with on-site automated Davis Vantage Pro weather station. Davis Instruments Corp., Hayward, CA.
Please send comments and suggestions to: lorraine.berkett@uvm.edu
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