Wandai orchid mosaic and stripe necrotic disease

Distribution: worldwide.

Pathogen: Bandai orchid mosaic virus (Vanda mosaicvirus).

Host: Vanda.

Symptoms: twisted petals and sepals, mottled flowers; faint or inconspicuous spots on leaf tips.

Prevention and treatment: the control of virus disease is mainly to remove diseased plants, improve environmental hygiene, disinfect appliances and other methods, in order to prevent its spread. At present, it is internationally recognized that the better disinfectants are: 1,2% formalin and% sodium hydroxide aqueous solution (which can no longer be used after turning green); 2, 164g anhydrous or 377g sodium phosphate (Na3PO4) with 1L water (1000cc). Can be used for disinfection tools, environment, etc. (Chen Xinqi, Ji Zhanhe)