Chestnut 1 is a relatively tall tree and fruit tree, and its growth and fruiting have two main characteristics: one is strong photophobia; The second is the result of strong support. Chestnut generally produces fruiting branches from several buds at the top of fruiting branches. Strong fruiting branches not only form yield, but also are the main branches to expand crown and cultivate backbone branches. Shaping and pruning should focus on promoting growth. The top advantage of chestnut makes the growth potential and growth of branches in different parts of the crown have obvious differences. The growth potential of the top upright branches is the strongest, and the strength of the lower branches is weakened in turn. Sagging branches often die of natural causes. The growth of fruiting branches, the number of fruiting branches and the size of chestnut in different parts of the crown are also obviously different.
Chestnut weevil and peach fruit borer have become the main pests of chestnut fruit in Tongbai Mountain area. Two kinds of pests overwinter as larvae every two years 1 generation, and 3 ~ 4 generations a year, which are harmful from July to September every year. In larval stage, chestnut fruit was fumigated with 56% aluminum phosphide and 98% methyl bromide for 48 hours, and the mortality rate was 90% ~ 100%. When the adult chestnut weevil was sprayed with 10% imidacloprid wettable powder 1400 ~ 2000 times, and the egg moth was sprayed with 20% acetamiprid wettable powder 2500 ~ 3000 times, the fruit eating rate decreased by 95%.
3. The pruning of young chestnut trees should follow the principle of "hibernation pruning as a supplement, light but not heavy, sparse and not pruning". When pruning in winter, all the lateral branches below 40-50 cm of the trunk are cut off, and the over-dense branches, slender branches, overlapping branches and cross branches in the trunk are drained. At the same time, select fruiting branches, adjust the distance and direction between branches, and cultivate main branches. The extension branch of the main branch can be delayed for one year and cut short for two years.