Cedar Pests and Diseases and Their Control

Diseases of cedar and their prevention and treatment

Botrytis cinerea

The disease mainly harms the current year's young shoots and two-year-old twigs of cedar, and can be divided into three types: young shoot dieback type, ulcer type and twig dieback type. The prevention and treatment methods are as follows:

1. Cedar is suitable for planting in places with good drainage, ventilation and sufficient light. Avoid planting too densely.

2. Prune and destroy diseased branches in time.

3. When the disease occurs, it is necessary to spray chemical agents such as 1000 times diluted benomyl wettable powder in time for effective prevention and control.

Leaf blight

Forest drought, poor soil, pests and diseases, and improper management may all contribute to the occurrence of leaf blight. The prevention and control measures are as follows:

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

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

3. After the ascospores mature, spray 0.3-0.5 degrees Baume lime sulfur mixture, or 65% wettable 3x solution and other chemical agents for prevention and control. It needs to be sprayed 2-3 times, once every 10-15 days.

Root rot

Occurs in cedar roots, especially new roots. The initial lesions are light brown, then gradually turn into dark brown and black brown, and the cortical tissue undergoes water-soaked necrosis. When the disease is severe, the needles fall off and the entire plant dies. The prevention and treatment methods are as follows:

1. Improve cultivation techniques and strengthen management.

2. When the disease occurs, water the roots with pesticides such as ethylene phosphine aluminum, ridomycin, and dichlorvos.

Cedar Pests and Their Control

The pests of cedar include red wax scale and scale insects. The following are some general measures that can be taken:

1. During the winter, spray 3-5 degrees Baume lime mixture on the branches and trunks.

2. The plants need to be properly pruned in winter and summer, dense and insect-infested branches need to be removed, and ventilation and light transmission need to be enhanced to inhibit insect development.

3. When insect pests occur, spray corresponding chemical agents for prevention and control.