First, the symptoms
Pumpkin powdery mildew is one of the most common and serious diseases of pumpkins. Pumpkin is the most serious melon in the powdery mildew of melon. The main damage to the leaves, the early onset of the leaves or leaves on the back produce a white nearly round small white spot, mostly in the foliage, with the development of the disease to expand into four weeks into the edge is not obvious contiguous white powder, causing significant obstruction of photosynthesis, serious Leaves yellow and even scorch, affect the pumpkin fruit.
Second, drug control methods
Before the occurrence of the disease, 53.8% can be used to kill 2000 type 1000 times liquid. In the early stage of disease, it is possible to use 10% Shigao 1500 times, or 40% Fuxing 8000x, or 43% Prec 5000x, or 12.5% ​​Subao 2000x, or 2% plus 600x for spraying. Spray once every 7-10 days, spray 2-4 times continuously. It can also be controlled by baking soda 600 times. Spraying is started when there are 1-2 lesions in individual leaves, sprayed once every 3-4 days, and sprayed 4-6 times successively. Baking soda can not only prevent diseases, but also promote growth, and increase pumpkin yield by 10-20%. When spraying, use a small-diameter jet to reduce the surface humidity of the blade.
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