1 Castanea mollissima is a relatively tall arbor fruit tree, and its growth results have two main characteristics: first, strong light; 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.
2. When spraying 65,438+00% imidacloprid wettable powder 65,438+0,400 ~ 2,000 times and 20% acetamiprid wettable powder 2,500 ~ 3,000 times during the egg stage of chestnut weevil, the moth eating rate decreased by 95%.
3 Pruning should master the principle of "hibernation pruning as a supplement, should be light but not heavy, and less sparse should not be cut". When pruning in winter, all the lateral branches below 40 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 branches of backbone branches can be delayed for one year and cut short for two years.