1959 Volume 28 Issue 4 Pages 297-305
The effects of green wood pruning on the development of flowers and shoots were observed from 1936 to 1938, and again in 1953 and 1955. The results obtained can be summarized as follows:
1. Cutting back of branches of one, two or three years old decreased not only the number of flowers and shoots, but also the vigour of shoot growth in the following spring. The more severely the branches shoots were cut back, the stronger the effects appeared. Thus, cutting back of green wood was of no value in growing the bearing shoots for the next year.
2. When the cutting back of green wood was so severe as to decrease the number of flowers by one-third, it promoted the growth of shoots. But such heavy pruning is too laborious to be applied on large trees.
3. Pruning off of all branches of one-year-old without cutting back two-year-old branches induced more vigorus growth of shoots than that with cutting back of two-year-old branches.
4. The seasonal effect of pruning on the number of flowers and the shoot growth was not remarkable for a period of five months from November to March next.
5. When the previous summer's shoots were cut back in early spring, vigorous shoots grew in late spring. When all the summer shoots, saving the portion of spring shoot, were pruned off, the shoots grew more vigorously.