Chemical control method of early stage of downy mildew on spinach
Downy mildew is a common disease in spinach production in protected areas, especially in spring and autumn.
The initial lesions were pale yellow on the front of the leaves, irregular in shape, of varying sizes, and with no obvious edges, with a grayish purple mold layer on the back. The lesions spread rapidly and are connected together, causing the leaves to turn brown and die. The disease gradually developed from the outer leaves to the inner leaves and spread from the lower part to the upper part. The severe whole leaves turned yellow and died. Seed carrier can also cause the symptoms of atrophy. Diseases generally occur severely in heavily populated and densely planted plots or in sheds with excessive watering volume.
Prevention and treatment of spinach downy mildew Note: selection of disease-resistant varieties, a reasonable rotation, downturn rotation, reasonable dense planting, increase phosphorus, potash fertilizer; pay attention to control the water, reduce the greenhouse humidity.
At the early stage of disease, chemical prevention and control methods can be adopted in a timely manner. Promazine (72.2% Prokary) water solution 800 times fluid or Ezine (64% antivirus) wettable powder 500 times fluid, or metalaxyl Ledomir), mancozeb (Dasheng, Puke), triethylaluminophosphate (aluminium diethyl bromide, epimedium).
Pay attention to the use of the above-mentioned agents or compounding agents, such as 58% metalaxyl MnZn wettable powder 500 times. Every 7~10 days, spray 2~3 times continuously. In the evening room, 45% chlorothalonil smoke and 15% downy mildew can be used to prevent disease.
Bio-pesticides can be used with 0.3% matrine pesticide 500 to 800 times, spray control.
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