As the weather entered March, the temperature in many places in the country has risen to a dozen degrees. Although the temperature has come up, precipitation in some places is also increasing, and the humidity of the air and soil will increase. This kind of weather is planted in the spring. The friend of the leek can be less friendly, because the leek will be prone to gray mold, resulting in reduced production. Let's take a look at the performance and prevention methods of amaranth gray mold with Huinong.
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Amaranth gray mold, also known as leukoplakia rot, is a disease that often occurs during the cultivation of leeks over the years, and is very difficult to control, mainly because the leaves of leeks will dry or rot or die.
1. Performance of amaranth gray mold
The symptoms of white spot gray mold, after the disease, the abundance of small oval spots on the front and back of the leaves. As the disease progresses, these small lesions will slowly descend from the tip of the leaf. Spread and development, and finally spread into larger lesions, and then the leaves of the leek will turn green and yellow, and in the case of high humidity, the mold will grow on the lesions.
2. Prevention and cure method of leeks gray mold
1. Avoid heavy planting
When the amaranth is planted for a long time, it will lead to aggravation of the disease in the day before yesterday. Generally, the amaranth is continuously planted in the same piece. When it is 2 to 3 years, it should be planted in a timely manner. You can choose cruciferous crops, but Be sure to avoid cropping with leek onions, garlic and other crops to prevent cross-infection and aggravate the disease.
2. Select resistant varieties
The use of relatively strong disease-resistant seeds is one of the main methods to reduce the disease of amaranth gray mold. When choosing amaranth, you should choose a brand with good disease resistance and stable yield. In addition to the variety, when selecting seeds, you should choose those seeds with higher purity, stronger germination, full and full of seeds, and no disease. It is best to use new seeds to avoid slow sprouting, uneven emergence, and pests and diseases. And so on.
3. Prevention management before planting
Avoid amaranth due to diseased soil or seeds. In the first half of the year before sowing, the soil should be deep-turned and dried. At the same time, the seeds should be placed in a sunny place to be aired, and the disease can be killed by ultraviolet rays in the sun. At the same time, after the harvest of the leek, the diseased plants, the residual branches, and the fallen leaves in the field should be thoroughly cleaned.
4. Scientific fertilization
In the management of fertilization, mainly organic fertilizer, supplemented by chemical fertilizer, and appropriate application of some nitrogen fertilizer and phosphate fertilizer potassium fertilizer. Amaranth should be used for 2 to 3 times of topdressing during the growth period. It can be used in the first half of September and the end of October, and in the first ten days of October. After the leek enters the harvest period, it can be used once every harvest.
The above is the performance and prevention methods of the leek gray mold caused by Hui Nong. I have learned it. The gray mold of the leek is very harmful to the cultivation of the leek. The growers must take precautionary measures.
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