It is necessary to know how to control diseases and insect pests during the dormant period of cedar.

When the cedar is dormant, how should the process of controlling diseases and insect pests be carried out?

Treatment of bark: in early winter or early spring, scrape off the old warped, diseased and worm-eaten bark at the branches of the trunk, big branches and branches, and burn them or bury them deeply.

Middle ploughing woodland soil: ploughing woodland before freezing can not only loosen the soil to preserve soil moisture, store rain and snow, and promote root growth, but also turn the remaining withered branches and leaves into the soil, but also turn the overwintering pests to the ground. Prey by natural enemies or freeze to death.

Removal of dead branches and fallen leaves: after the fallen leaves of cedar, the withered branches, fallen leaves and weeds of diseases and insect pests are cleaned and buried or burned in time, which is helpful to reduce the number of pathogens and pests overwintering.

Trunk whitening: after the defoliation of cedar, at the base of the trunk and big branches, using whitening agent can eliminate the overwintering diseases and insects on the trunk, and prevent sunburn, freezing injury and so on. The whitening agent can be prepared with 25 parts of water, 10 parts of quicklime, 1 part of stone-sulfur mixture, 1 part of salt and a small amount of animal oil.

Spray control: spraying 5 Baume stone sulfur mixture plus pentachlorophenol sodium 200 times after defoliation and before germination of cedar has a significant effect on eliminating overwintering pathogens and insect eggs and reducing the harm of diseases and insect pests in the coming year.