ISHS Acta Horticulturae 276: II International Symposium on Computer Modelling in Fruit Research and Orchard Management
DELAYED FOLIATION OF APPLES AND CHERRIES IN UTAH AND COLORADO DURING 1989 |
| Authors: | J. LaMar Anderson, A. H. Hatch, S. D. Seeley, M. K. Rogoyski, R. Renquist |
| Abstract:
Delayed foliation of apple trees was quite prevalent in Utah and Western Colorado in the spring of 1989. Similar symptoms were also observed on sour cherry in Utah. In both states autumn temperatures were quite warm and little effective chilling occurred. Winter temperatures remained quite cold until early March which had a week of unusually warm weather. Many orchard sites did not accumulate the required 1234 chill units for apples to break winter rest according to the Utah model. It is postulated that the period of warm weather during the second week of March stressed apple and cherry trees out of rest even though the required chilling for normal rest completion had not occurred at that time and this premature rest termination induced the delayed foliation symptoms observed in 1989. | |
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