How to clear the roots of the ground?

1- Drilling holes in tree heads, irrigation and weeding-Not environmentally friendly.

2- Put the tree head horizontally, put one kilogram of salt in a thick plastic belt, and wrap the belt around the tree head, so that the retractable plastic bag can be tied tightly, and the salt juice will penetrate into it and make it die and rot, which is more environmentally friendly.

Preventive measures:

1, clear the garden thoroughly. In winter, the dead branches, fallen leaves and diseased fruits in the garden are swept away and burned outside the garden. Using raw ash 12.5 kg, sulfur powder 0.5 kg, salt10.5 kg, vegetable oil 0.25 kg, and water 50 kg, a whitening agent was prepared for whitening trunk in winter.

2. Strengthen management.

First, dig deep into the soil, that is, dig deep into the soil after harvesting walnuts and before defoliation, so as to ripen the soil, promote root system development and improve absorption function. The suitable digging depth is 20-30 cm.

2. Apply sufficient fertilizer, combined with deep ploughing, apply decomposed organic fertilizer 150-200 kg per tree, and topdressing NPK compound fertilizer once in June and July.

Third, timely irrigation to promote the robust growth of trees and improve disease resistance.

3. Cut off dead branches. Cut off the diseased branches in time and take them out of the garden to burn. At the same time, do a good job in summer pruning, sparse dense branches, pests and diseases, long branches, improve ventilation and light transmission conditions, and reduce the incidence.

4. Chemical control. From June to August, 70% thiophanate-methyl wettable powder 800- 1000 times or mancozeb wettable powder 400-500 times was selected for spray control, and it was sprayed 1 time every1day for 3-4 times, and obvious control effect could be obtained. At the same time, it is necessary to prevent and control stem borers such as Anoplophora yunnanensis and Walnut Worm in time to prevent germs from invading through drilling holes.