Cucurbita powdery mildew mainly damages the leaves. The positive and negative sides of the leaves are round and small, and the upper white powdery mildew (mycelium, conidial stems and conidia of pathogens) gradually expands and converges. The white powder turned brown and dry, and the white powdery mildew turned white. Is a melon monosaccharomycete. The temperature of 10°C-25°C can be popular, depending on the humidity and the host's growth. High wet germination rate. High temperature drying is conducive to conidial reproduction, aggravate the condition. Air humidity is usually 45% to 75%, and over 95% is significantly inhibited. In less rainfall years, the incidence is heavier. Poor ventilation and drainage, excessive nitrogen fertilizer application, or lack of fertilizer, lack of water, and poor growth all aggravated the disease. Diseases develop continuously in cloudy days and hot weather.
1. Seedling prevention Many vegetable farmers are still sticking to the traditional management concepts of “talented management, non-regularization, etc.†and must be replaced by the scientific concept of “prevention first, comprehensive prevention and controlâ€. With chlorothalonil, carbendazim or thiophanate-methyl spray for 7-10 days, all kinds of diseases are prevented and the effect is good.
2. Increased ventilation and light transmittance The timely removal of the old leaves, yellow leaves, and diseased leaves from the lower part of the plant increases its ventilation and light transmission, which can greatly reduce the incidence of powdery mildew and increase flowering fruit setting rate.
3. In the early stage of the disease prevention and treatment, use tetraflumzilazole + spread through + one hundred fertilizer formula uniformly spray, or Xingnong 50% sulfur suspension 250 times + exhibited + chlorophyll formula, if the growth is too busy, available Guanxin + Shigao + Exposure + Formulation Treatment. Technical points: early prevention, afternoon defense, spray, water.
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