What caused the onion soft rot to occur? After years of research, it has been found that the following points are the main cause of disease epidemics.
1. Climate element Onion bulb expansion is generally between June and July, when the temperature is high, it is the suitable temperature for the occurrence of soft rot, and the amount of rainfall is the main factor for the soft rot.
2. The varieties cultivated in recent years are mostly disease-resistant varieties, such as Kamui in Japan, Fast Bear, and Crown King of the United States.
3. Rinse mouth arrangement According to the results of a few years of investigation, it was found that the plots were severely affected by onions, cabbages, cabbages, potatoes, etc., and the plots used as soybeans, corn, and other field crops were light.
4. Planting methods are poorly drained, waterlogged in the field, high soil moisture, and poor permeability, which is conducive to disease occurrence. The survey found that low-lying land was heavier than the high-lying land and the level was heavier than that of ridges and sorghum.
5. Wound causes Bacteria can invade through wounds. Wounds include natural wounds, insect wounds, mechanical wounds, prolonged rain, excessive watering, etc., which can cause wounds and the onset of disease. Litters such as leaf miners, mantle, and thrips can also cause wounds. These wounds increase the chance of onset.
6. Fertilizer partial application of nitrogen fertilizer, the amount of organic fertilizer is less than the amount of land mass balanced fertilization.
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