Symptoms: Unlike cucumber downy mildew, pumpkin downy mildew has no obvious polygonal lesions but is slightly rounded. Blurry yellow spots initially appeared on the leaves, and soon after the gray and white moldy layer formed on the back of the leaves was severe, the lesions quickly withered or the leaves margin withered.
Pathogens: It belongs to the same family of pathogens as cucumber, watermelon and melon, but it is ecologically different. Pathogens invading the squash can invade cucumbers, but pathogens that invade cucumbers do not invade pumpkins. The germs produced conidiophore stems from the stomata on the back of pumpkin lesions, and the apical branches formed dendritic conidia. The conidia germinate and germinate when they encounter water droplets and release zoospore. When zoospores fall on other leaves, they can be infected to form lesions. Control methods: Occur in a variety of cultivated forms of the squash, when the leaves on the water droplet temperature reached 20-25 °C, can occur at any time. The incidence of continuous rainfall or humidity in large greenhouses increases, and once it occurs, the condition develops very rapidly. Choose well-lighted, well-ventilated and easily drainable land, and wetlands improve drainage conditions. Exposed cultivation should cover straw to prevent the spread of pathogenic bacteria and soil particles.
Pathogens: It belongs to the same family of pathogens as cucumber, watermelon and melon, but it is ecologically different. Pathogens invading the squash can invade cucumbers, but pathogens that invade cucumbers do not invade pumpkins. The germs produced conidiophore stems from the stomata on the back of pumpkin lesions, and the apical branches formed dendritic conidia. The conidia germinate and germinate when they encounter water droplets and release zoospore. When zoospores fall on other leaves, they can be infected to form lesions. Control methods: Occur in a variety of cultivated forms of the squash, when the leaves on the water droplet temperature reached 20-25 °C, can occur at any time. The incidence of continuous rainfall or humidity in large greenhouses increases, and once it occurs, the condition develops very rapidly. Choose well-lighted, well-ventilated and easily drainable land, and wetlands improve drainage conditions. Exposed cultivation should cover straw to prevent the spread of pathogenic bacteria and soil particles.
Polymer Endoscope Cleaning Workstation
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