The influences of defoliation damage from the typhoon on the content of starch and the buds blooming of kiwifruit [Actinidia deliciosa] in the following year
2007
Miyata, N.(Ehime-ken. Fruit Tree Experiment Station, Matsuyama (Japan)) | Yano, T. | Matsumoto, H.
We examined the starch contents of the annual shoot and root of kiwifruit (Actinidia deliciosa) in the winter on the different degrees of defoliation damage from the typhoon. In the next spring, the percentage of bud breaking and the number of female flower buds were also investigated to clarify the influences of defoliation. There were no significant differences between the starch contents and the degrees of defoliation in the shoot and root. However, the starch content of the root in the severe (80% or over in the percentage of defoliation) and the middle (31-50%) damaged tree was slightly lower than that in the mild (30% or less) or without damage. There were no significant differences in the percentage of kiwi buds blooming in the following year. The number of buds in the severe and the middle damaged tree was significantly lower than that in the mild or without damaged tree. The number of buds in the severe damaged tree was lowest. There were sufficient amount of buds on the mild or without defoliation orchard, however, small amount of buds were found in the severely damaged orchard regardless the density of shoot in the unit area. In the middle defoliation orchard, amount of buds were unstable in individual orchard. From these results, we should maintain the density of shoot on the usual way in the mild or without damaged orchard to get normal amount of product. In the middle defoliation orchard, slightly higher density of shoot is required to get more appropriate amount of flower. It is difficult to get the usual amount of flower in the severe damaged orchard, and the recoveries of the tree vigorous and the condition of nutrition is needed.
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