Identification and Prevention of Downy Mildew on Spinach

The downy mildew of spinach is caused by the flagellin subphylum fungi, spinach downy mildew, and mainly damages the leaves. Disease usually starts from the lower leaves of the plant and gradually develops upwards. At the onset of the onset of the disease, pale yellow dots were produced. After the enlargement, the lesions were irregular and the edges were not obvious. The diseased part of the diseased leaves produced a layer of downy mildew, which was the sporangia and sporangia of the pathogen. After gray and gray purple. Lesions develop into yellow-brown patches in the middle and late stages. In severe cases, the lesions are connected to each other and the color is yellowish to brown, leaving the entire diseased plant blade yellow and dead. The most suitable disease environment for the disease is the average daily temperature of 7 ~ 15 °C, relative humidity of 85% or more; the optimal incidence of more than five leaves to harvest before harvest, incubation period of 5 to 15 days. At the onset of the disease, ten days of rainfall is more than 50 millimeters, and there is continuous rain and rain for 2 to 3 days in the weather conditions easily cause disease. The main epidemic period is from spring to March to April and fall from September to December.

Control methods:

1. Remove diseased seedlings in a timely manner, promote rotation cultivation with other vegetables, strengthen management, reasonably control water, timely release air and reduce humidity, and sunny days can create ecological conditions that are not conducive to the occurrence of germs through the sterilization method of high-temperature stuffy sheds.

2, using chemical treatment, seed coating with 2.5% Shiloki after sowing, the beginning of onset of spraying, 1 72% Kelu wettable powder 1000 times, 250% Anke manganese zinc wettable powder 1000 times, 353 % Kimredo Meer WP 800 times, used interchangeably.

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