Towering type: There are many such trees in various places. The crown of these trees is more than 3 meters, and the height is 3-5 times larger than the width. The tree is narrow, the branches are straight and the branches are too long. After flowering every year, the flowers and fruits fall seriously, the yield is low, and even it does not bear fruit every year. In some years, although a small amount of fruit is produced; However, there are also many abnormal fruits, such as B 1, B2 and B3 in Figure 4.
Fig. 4 Normal and Bad Tree Patterns of Dongkui Myrica rubra
A 1 and A2. Normal trees B 1, B2 and B3. Towering trees C. Dense trees D. Slender trees E. Small-leaved trees
The reasons for the towering trees are as follows: First, there is no habit of controlling the overgrowth of branches of Dongkui Myrica rubra, and branches are allowed to grow from young trees, thus forming a tree with long branches and high crowns, which is conical or cylindrical. Second, the plants are planted too densely, and they are not trimmed and allowed to grow upwards, which leads to extrusion friction between plants, cross branches and mutual influence. Third, it was planted under pine, fir, maple, oak and other trees, and it was not cut down in time to form a towering and irregular crown, such as B2 and B3 trees. Fourth, because the scion is regarded as the scion, the tree nature becomes vain.
Dense: the shape of this tree, although round or high round; But the crown branches are dense. Some tree crowns, because long branches extend to the periphery of the tree crown, form a branch order, which makes the tree crown appear to protrude many angles, as shown in C in Figure 4. Letter from Li Youming from Zixi, Jiangxi Province: I have1more than 60 Dongkui bayberry trees, which have been planted for 14 years. The first four to seven years, good performance. But now the branches are too dense, and there is no sunshine under the tree. There are many horns on the tree. There are few flowers and small fruits every year. Is the nature of the tree changed? I saw the photo he sent, which is the pattern of C in Figure 4. These "corners" are the branches formed by long branches. Because of the dense branches, it is difficult to form flower buds, flowers are not easy to open, and the flowers and fruits are seriously falling. Because of the contradiction between growth and reproduction, young fruits are malnourished and small in shape. Because of the dense periphery of the crown, the branches in the inner cavity are not easy to wither or germinate, and the inner cavity is empty, resulting in a thin fruit layer.
Reasons for dense trees: mainly because of poor pruning or no thinning. The more severe thinning is, the more branches move outward, and the more internal branches will wither, forming a vicious phenomenon of hollow inside and thick outside.
Stubborn: This tree sometimes looks like a palm. A branching order, not related to each other. If Zhang Mingyuan, from Jixi, Anhui Province, hadn't sent a photo saying that he had planted 52 Dongkui bayberry trees for seven years and had not yet produced 1 fruit, it would be clear. At first glance, it really looks like a lush maple with tall and straight branches and dark green leaves.
The reason for the emergence of big trees is that when Dongkui Myrica rubra is young, it mainly sprouts big branches and long branches. This kind of long branch can extend more than 1 m at a time, with an average length of 20 ~ 30 cm. These long branches have influence on the rapid expansion of young tree crown, but the long branches on young trees should also be controlled. Otherwise, draw long branches with growing branches, which will become the tree shape of D in Figure 4. In addition, when the scion was adopted, it was a long branch on the mother tree, and its apostolic nature continued to the next generation.
Lobular type: short crown, short branches, long and narrow leaves like fir leaves, dark green leaves. Therefore, its symptoms are different from boron deficiency. Because Myrica rubra is short and overgrown, its leaves are small and yellow after boron deficiency, so boron deficiency is also called "lobular disease". And this kind of lobular tree, one is short, but thick, not clustered. Second, although the leaves are long and narrow, they are not clustered. There are 7 lobular trees in Dongkui Myrica rubra Orchard, Linxinlian 130, Songxi, Fujian. Li of Nandan, Guangxi wrote that he has three lobular trees. Both Lin Xinlian and Li said that this kind of tree will bear fruit, but the fruit shape is small and the yield is low.
The reason of lobular tree: because I am not fastidious; No practical experience, please forgive me. It's just that Lin Xinlian and Li told me that their seedlings were all bought in the market. Therefore, it is speculated whether the rootstock is mixed with Myrica rubra native to Yunnan and Guizhou. Whether it is caused by disease needs further study. I told them to apply more boron fertilizer in the experiment, but according to the report, the situation has not improved.