Talking about the symptoms, regularity and prevention methods of onion blight
Onion is a common vegetable. If the field management is not done during the planting process, the growers will encounter the onion disease, which will cause serious economic losses. The following is a brief analysis of the onion disease. Symptoms and laws.
The epidemic is the meaning of the impotence, referring to the acute epidemic. Plant diseases with the word "epidemic" are also acute diseases that are easy to expand rapidly. Once they are popular, they will cause huge losses to crops. The following small series will tell you about the prevention and treatment of onion disease erosion!
First, the symptoms of onion blight
Leaves and peduncle are initially infected with blue-white and no obvious spots.
When expanded, it becomes a grayish white spot, causing the leaves to wither.
When the rain is continuous or the humidity is high, the disease minister produces white hairy mold; when the weather is dry, the white mold disappears, and the white hairy mycelium is seen on the epidermis.
Second, the onset of onion blight
Sporozoites, chlamydospores or mycelia overwinter in the diseased body, sporangia and zoospores are produced when the conditions are suitable for the next year, and the spores are germinated to produce germ tubes, which penetrate the host epidermis and directly invade. The spore sac is re-infected and enlarged. The pathogen is suitable for high temperature and high humidity environment. The temperature suitable for onset is 12-36 ° C, the relative humidity is above 90%, and the disease is most serious from adult to harvest. Zhejiang and the middle and lower reaches of the Yangtze River mainly occur from May to July. The terrain is low, the field is easy to accumulate water, the rain is continuous; the planting density is large, the field permeability is poor, the management is extensive, the nitrogen fertilizer is applied, the plants are long, or the plants are often lack of fertilizer and water, the plant growth is weak, and the disease resistance is low.
Third, the prevention and treatment of onion blight
It has been rotated for more than 2 years with non-lily vegetables. Choose well-drained plots for planting, rational close planting, remove accumulated water in time after rain, strengthen cultivation management, and rationally adopt formula fertilization to enhance host disease resistance. Clear the field scum in time after harvest.
Chemical Control - Chemical Reference
75% chlorothalonil wettable powder (microtoxic) sprayed with 600~800 times
722 g / liter of downy mildew hydrochloric acid saline (low toxicity) using 800 ~ 1000 times spray
25% pyraclostrobin suspension (low toxicity) 1500~2000 times spray
86.2% cuprous oxide wettable powder (low toxicity) using 2000~2500 times liquid spray
72% manganese zinc·cream urea wettable powder (low toxicity) spray with 600~800 times liquid
25% azoxystrobin water dispersible granules (low toxicity) spray with 1500~2000 times
77% copper hydroxide wettable powder (low toxicity) spray with 800~1000 times
Onion blight is a very powerful disease. It is highly contagious. If an onion disease is not treated in time, the whole onion planting base will be infected, so all growers must pay attention to it.
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