National orchid leaf wilt stripe necrosis

Distribution: cultivated greenhouse, common in the United States.

Pathogen: tomato ringspot virus (Tomato ringspotvirus).

Parasitism: Cymbidium.

Symptoms: inobvious strip yellowing and necrosis.

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 2% 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)