| Treated | Flower bud (%) | Leaf bud (%) | Twig (%) | |||||||
| Date | Temp. | JMy | CH | KH | JM | CH | KH | JM | CH | KH |
| October 11 | −6˚C | 23.5 ± 5.6a | 26.7 ± 12.0a | 20.4 ± 11.6b | 22.1 ± 6.0a | 21.6 ± 11.1a | 29.6 ± 5.5a | 83.4 ± 9.5a | 44.4 ± 24.2a | 66.7 ± 16.7a |
| −9˚C | 7.0 ± 4.4a | 47.8 ± 24.8a | 81.0 ± 15.6a | 26.0 ± 3.2a | 42.8 ± 21.4a | 53.8 ± 17.7a | 89.0 ± 11.0a | 88.9 ± 5.6a | 88.9 ± 11.1a | |
| November 11 | −6˚C | 8.3 ± 5.2a | 26.3 ± 6.9a | 3.3 ± 3.3b | 0 | 11.6 ± 8.7a | 6.1 ± 6.1b | 0 | 0 | 0 |
| −9˚C | 9.3 ± 0.7a | 18.3 ± 2.4a | 27.4 ± 1.2a | 10.0 ± 5.8a | 17.7 ± 13.0a | 44.4 ± 8.0a | 61.0 ± 20.1a | 50.0 ± 0b | 72.2 ± 14.7a | |
| −12˚C | 12.7 ± 6.6a | 24.2 ± 5.5a | 39.4 ± 4.6a | 13.3 ± 3.4a | 42.4 ± 10.5a | 33.3 ± 8.3ab | 55.7 ± 5.7ab | 100.0 ± 0a | 100.0 ± 0a | |
| December 11 | −12˚C | 17.4 ± 8.1b | 30.0 ± 15.3b | 26.7 ± 7.0b | 0 | 31.3 ± 17.8b | 36.0 ± 7.4b | 11.1 ± 5.6b | 44.3 ± 5.7b | 44.3 ± 5.7b |
| −15˚C | 25.0 ± 2.6b | 10.0 ± 10.0b | 75.0 ±25ab | 0 | 30.0 ± 6.8b | 24.3 ± 12.3b | 22.2 ± 5.6b | 50.0 ± 0b | 55.7 ± 5.7b | |
| −18˚C | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 93.3 ± 11.1a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | |
| −21˚C | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 93.3 ± 21.4a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | |
| January 12 | −15˚C | 4.1 ± 1.5b | 12.5 ± 6.6b | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| −18˚C | 4.9 ± 2.8b | 1.8 ± 1.8b | 5.8 ± 3.6b | 6.4 ± 3.2b | 0 | 0 | 0 | 0 | 0 | |
| −21˚C | 95.8 ± 2.1a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 11.1a | 100.0 ± 0a | 44.4 ± 5.6b | 72.2 ± 14.7a | 66.7 ± 16.7a | |
| −24˚C | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 21.4a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 72.2 ± 11.1a | |
| February 12 | −18˚C | 1.8 ± 1.8c | 0 | 5.8 ± 3.1b | 0 | 0 | 10.3 ± 1.2c | 0 | 0 | 0 |
| −21˚C | 58.7 ± 8.0b | 49.1 ± 6.4b | 33.9 ± 19.3b | 50.8 ± 6.5b | 49.1 ± 4.0b | 43.6 ± 6.1b | 33.3 ± 0b | 72.2 ± 5.6b | 55.6 ± 5.6b | |
| −24˚C | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | |
| March 12 | −12˚C | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| −15˚C | 17.3 ±10.2b | 17.5 ± 1.3b | 6.4 ± 3.9b | 0 | 0 | 0 | 0 | 0 | 0 | |
| −18˚C | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 100.0 ± 0a | 38.9 ± 5.6a | 100.0 ± 0a | 88.9 ± 11.1a | |
| April 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| −3˚C | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| −6˚C | 83.2 ± 1.6a | 81.4 ± 6.2b | 59.3 ± 20.6a | 100.0 ± 0a | 100.0 ± 0a | 66.4 ± 2.2a | 55.6 ± 5.6a | 50.0 ± 9.6b | 38.9 ± 5.6a | |
| −9˚C | 75.1 ± 7.4a | 100.0 ± 0a | 34.4 ± 8.7ab | 95.2 ± 4.8a | 100.0 ± 0a | 39.9 ± 9.4b | 77.8 ± 8.7a | 88.9 ± 11.1a | 38.9 ± 5.6a | |