Rejuvenation method for dying walnut trees harmed by diseases and pests

Abstract

The invention relates to a rejuvenation method for dying walnut trees harmed by diseases and pests and belongs to the technical field of forestry. Two methods are provided for rejuvenation of walnut trees with trunks harmed by diseases and pests at different degrees. The methods both include the steps of trunk cutting and grafting. In the first step of trunk cutting, for trees slightly harmed by diseases and pests, trunks are cut off from the portions 1 m away from the ground in the middle-ten-day period of March; for aged trees seriously harmed by diseases and pests, trunks are sawn off from the portions 0.05 m away from the ground in the middle-ten-day period of March, and two new strong branches of each tree are cultured in an induction mode and are cut off from the portions 0.15 m away from the ground when walnut trees sprout in spring in the second year. In the second step of grafting, the middle segments of fine annual branches with the thickness of 2.5-4 cm are selected as scions, grafting is carried out on the sections, with smooth bark, of stocks, blank parts of 3 mm are reserved at the upper ends of the scions and are tightly wrapped and bundled, two scions are grafted in the symmetric north-south directions or east-west directions of each stock respectively, the grafted branches are covered with waterproof kraft paper envelops after grating, and the lower ends are not sealed. By means of the rejuvenation method, the vigor of walnut trees can be recovered.

Description

technical field [0001] The invention relates to a technique for rejuvenating a dying walnut tree, in particular to a method for rejuvenating an endangered walnut tree that is endangered by diseases and insect pests, and belongs to the technical field of forestry. Background technique [0002] During the period of returning farmland to forests, most of the walnut seedlings planted in my country were seeded and bred. The varieties were hickory, iron walnut, etc., which showed the characteristics of late fruit, poor quality, low yield per plant, small fruit, thick shell, and low kernel yield. The degree of breeding is low. Due to the long period and slow effect, most farmers only pay attention to planting, but their awareness of scientific management of walnut trees is weak. Most of the walnut orchards are abandoned and left to fend for themselves. There is no economic benefit, and it also affects the effectiveness of the project of returning farmland to forests. [0003] The ...

AI Technical Summary

Problems solved by technology

These methods are all aimed at the normal growth of walnut trees or old walnut trees, but it is not practical for the rejuvenation of walnut trees that suffer from diseases and insect pests and are on the verge of death. Therefore, it is of great ecological and economic significance to develop a rejuvenation method suitable for endangered walnut trees infested by diseases and insect pests