Diseases and insect pests of cedar and their control

Disease and control of cedar

Botrytis cinerea

The disease is mainly harmful to the young shoots and biennial twigs of cedars, which can be divided into three types: the withered shoots, the ulcerated twigs and the withered twigs. The control methods are as follows:

1. Cedar is suitable to be planted in a place with good drainage, ventilation and sufficient light. Do not plant too tightly.

2. Cut and destroy the diseased branches in time.

3. When the disease occurs, it is necessary to spray 1000 times of benlaite wettable powder and other chemicals in time for effective prevention and control.

Leaf blight disease.

Forest land drought, poor soil, diseases and insect pests and improper management may promote the occurrence of leaf blight. The preventive measures are as follows:

1. Strengthen the management and enhance the disease resistance of cedars.

2. Remove the diseased leaves as much as possible and reduce the source of infection.

3. Spray 0.3-0.5 Baume stone sulfur mixture, or 65% wettable daisent 8-fold solution and other chemicals for prevention and control after the mature of the ascorbic sac. Spray 2-3 times, once every 10-15 days or so.

Root rot disease.

Occurs in the roots of cedars, especially new roots. At the initial stage, the lesions were light brown, then gradually turned to dark brown and dark brown, and the cortical tissue was water stained necrosis. When the disease is serious, the needles fall off and the whole plant dies. The control methods are as follows:

1. Improve cultivation technology and strengthen management.

2. When the disease occurs, the root shall be irrigated with aluminum ethophosphate, Ralstonia, dixone, etc.

The pest of cedar and its control

The insect damage of cedars includes red tortoise wax scale and scale insect. Generally, the following measures can be taken:

1. Spray 3-5 pomegranate Salix mixture on the branches during winter.

2. In winter and summer, it is necessary to prune plants properly, remove overdense branches and insect branches, strengthen ventilation and light transmission, so as to inhibit the development of insect bodies.

3. Spray corresponding chemicals to prevent and control insect pests.