Technical points of high grafting and replacement of bayberry

1. Technical essentials (1) period: it is suitable for Zhejiang from mid-March to early April.

(2) scion selection: the state stipulates that all varieties that have passed identification and identification can be used as high grafting varieties, but Dongkui bayberry is the most commonly used in various places, because this variety has the advantages of large fruit shape, high quality, resistance to storage and transportation, and attractive market price. And its affinity is good. For the scion used for high grafting, the 2-year-old mature branches in the middle and upper part of the crown should be selected, the branches have turned green to gray, and the thickness is 0.8mi 1.2 cm. Note: the tree has not used paclobutrazol, otherwise its growth will stop after grafting.

(3) rootstock selection: the suitable rootstocks for bayberry are: water plum, thorn plum, red plum and all kinds of red bayberry trees, the best age is less than 15 years old, good root system, smooth bark and less damage. Note: trees that have used paclobutrazol too much in recent years cannot be high grafted.

(4) specific methods: the cutting methods of horseshoe shape, long spike and full envelope were adopted. Its scion length: 7mi 10cm, scion cutting side: front 2mi 3cm, back 0.5m 1cm, and requires smoothness. On the crown, the side with a height of less than 2 meters and a thickness of 3 mi 4 cm is selected for high connection, and about 5% of the auxiliary branches (also known as "diversion branch", "sudden water branch") are left in the lower part of the crown. Generally speaking, fruit trees of more than 10 years old can be grafted with 25 scions per tree; for young trees under 10 years old, they can be grafted with 15 scions per tree; the distance between joints should be more than 50 cm, so as not to cause crown depression due to too many branches. After grafting, all the wounds were bandaged with film; after survival, the scion was pulled out from the membrane seam.