The prevention and control methods of orchid blight, familiar with the turning basin and ramet of Cymbidium.

Symptoms: under the condition of long duration of high humidity, leaves and flowers produce waterlogged brown rot. The disease part has a white mildew layer that is not easy to find, and the disease part is grayish brown when it is dry. The disease of petiole and pedicel produces similar symptoms.

Disease characteristics: the disease is caused by fungi. The pathogen is a kind of Phytophthora Phtyophthora. The pathogen overwintered in soil or basin soil and spread with Rain Water or water splash in the second year. The disease is easy to occur when the temperature is about 20 ℃, continuous rainfall or air humidity. The humidity in greenhouse is high in winter or the humidity is heavy with the increase of temperature in spring.

Prevention and control methods:

(1) Horticultural prevention and control: after watering, it is necessary to release air timely and appropriately to prevent moisture retention and reduce the incidence of disease.

(2) Pharmaceutical control: spraying in time at the initial stage of the disease, 70% Baidefu wettable powder 600 times liquid, 58% metalaxyl. Manganese zinc wettable powder 700 times liquid, 64% poison alum wettable powder 600 times liquid, 72% gram dew or gram cream cyanide or gram kangling wettable powder 600 times solution, 69% Ang. Mn-Zn wettable powder 800mm 900 times liquid. Spray once every 10 days or so for 2 or 3 times in a row.