Dendrobium mosaic disease (Dendrobium

1. Harm: distributed in Japan, mainly harmful to Dendrobium.

2. Symptoms: obvious mosaic and green ring spots appear on Dendrobium. Chenopodium amaranth can be used as an indicator plant, and local discoloration spots are formed on the virus after concentration.

3. The pathogen: Dendrobium orchid mosaic virus (Dendrobium mosaic virus,DeMV), 750nmX13nm in size, formed an inclusion body in the plant cytoplasm, the lethal temperature was 50-55 ℃, and the in vitro survival time was 4-8 days.

4. the characteristics of the disease: the sap transmission of the virus.

5. Prevention and control methods:

(1) for some valuable virus-free orchids, they must be isolated from the orchid production base.

(2) in gardening operations such as ramets and turning pots, fingers and tools have to be re-sterilized every time they are planted.

(3) washing roots cannot be washed in the same container, and running water should be used to wash roots.

(4) the media such as peat, moss and gravel used for orchid culture should be disinfected.