First, the symptoms can occur from the seedling stage to the harvest period. The leaves are heavy, the petioles and stems are the next, and the fruits are rarely affected. In the early stage of disease, small round white spots were formed on the leaves or the leaves and young stems. The leaves were many on the front, and then they spread to the periphery with clear and contiguous white powder. The severe leaves were covered with white powder. In the late onset period, the white moldy spots turned gray due to the diseased silk, and piles of small yellow-brown powder spots appeared on the spots, turning black spots into small grains.
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Second, the incidence of the law of powdery mildew in the Chinese rose or greenhouse greenhouse and melon vegetables or sickness overwintering, as early as the source of infestation. The re-infestation of greenhouses is mainly caused by the conidiospore generated after the onset of transmission by air flow or irrigation. Due to the rapid propagation of this bacterium, it is easy to cause epidemic. Powdery mildew can occur at 10-25 °C, whether it is popular, depending on the humidity. Therefore, large greenhouse humidity is conducive to spore germination and invasive, to speed up the epidemic speed, high temperature is conducive to conidial reproduction and disease expansion, especially when the high temperature and humidity conditions alternate, there are a large number of powdery mildew disease, the disease is prevalent.
Third, control methods
1. Use resistant varieties.
2. Begin spraying 20% ​​Triadimefon Emulsion 2000 times, or 40% polysulfide suspension 600 times, 50% Sulphur Suspension 250 times, 2% Agricultural Anti Retardant 120 Water 200 times, 27% High Lipid membrane emulsion 80-100 times liquid.