Prevention and control of impatiens mosaic disease
The symptoms occur in the rhizome. At first, it became brown and constricted at the rhizome, and then caused the symptom of standing blight. General flower beds in the rainy season, potted flowers are too wet, the disease is more.
Pathogen PhytophthoranicotianaevanBredadeHaanvar.parasitica (Dastur) Waterhouse
Transmission routes and disease conditions of pathogens overwintered in seeds or in mycelia and oospores in the soil, and spread by wind, rain and irrigation water, the pathogens infected seedlings and caused lodging. In the adult stage, Rain Water was more, and the humidity was high. The suitable temperature for the development of the pathogen was 27-31 ℃, the highest was 36 ℃ and the lowest was 10 ℃. In case of overcast and rain or high humidity, or heavy soil viscosity, low-lying terrain and serious disease of continuous cropping.
Prevention and cure method
1. Remove the diseased leaves and increase the application of phosphorus and potassium fertilizer.
2. Spray 75% Chlorothalonil 8 clear wettable powder 500-600 times liquid, or 40% triethylphosphonate aluminum (ethyl phosphate aluminum) wettable powder 200 times liquid, 70% ethyl phosphine o manganese zinc wettable powder 500 times liquid, 58% metalaxyl o manganese zinc 400-500 times liquid, 72.2% Pulike water agent 700-800 times liquid, 64% poison alum wettable powder 500 times liquid.
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Impatiens mosaic disease
Impatiens mosaic disease is common in Shanghai, Guangzhou, Nanning and other places in China. [pathogen] Cucumber mosaic virus (Cucumbermosaicvirus,CMV), see Gladiolus virus disease. [symptoms] the new leaves at the top of the plant produce flowers and leaves, sometimes deformed; when they are serious, the apical tips are clustered and the plants are short. [incidence regularity and epidemic characteristics] the virus has a wide host range, with more than 60 species of aphids, including peach aphid, cotton aphid and corn aphid (Ap).
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How does impatiens suffer from powdery mildew?
[distribution] it happens all over the week. [symptoms] the disease mainly occurs on leaves and shoots, and seriously harms buds and capsules. The disease began in Beijing after June, and after July, the leaf surface was gradually covered with white powder layer, and gradually expanded to the whole leaf covered with white powder layer. In the later stage, yellow dots were formed on the powder layer, and the color gradually deepened and became dark brown, which was the closed capsule of the pathogen and was spherical under the magnifying mirror. The dark brown dots mainly appeared on the front of the leaves and the small dots on the back of the leaves were rare. In severe cases, the leaves withered and fell early. Shanghai is generally in bloom.
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