Many years of growing garlic production areas, garlic white rot and other soil-borne diseases have become increasingly serious, more difficult to control, has restricted the high yield and quality of garlic and planting efficiency.
According to the author's research on garlic for many years, it is believed that the control of garlic white rot must be prevented and treated from the early spring before it can receive corresponding effects. For example, after the spring rain or 3 to 5 days after the pouring of seedlings, the control of garlic white rot is often poor. At the same time, the disease causes a decrease in the growth of garlic, and the reduction in yield has been caused, even if it follows the outside temperature. When it rises to 20°C, the condition is in a recessive state, but the loss of production caused by garlic is also difficult to restore. The main reason is that the white rot of garlic is a kind of high-humidity and low-temperature fungus, which is suitable for the onset temperature of 6°C~20°C, and 14°C~18°C is the most suitable for the occurrence of diseases. When the relative water holding capacity in the field is more than 90%, this is extremely advantageous. The spread of the disease and the appearance of the disease. The temperature and the humidity in the field before the early spring rain or before the pouring of seedling water are small, which is not conducive to a large number of appearances of the disease. After the water is poured, the humidity in the field becomes larger and the temperature rises. The normal strains grew rapidly. The susceptible strains were more suitable for pathogens due to external conditions, resulting in severe disease, slow plant growth, and significant differences from normal strains in growth. In the diseased part of the field, a disease center emerged, and garlic seedlings appeared yellow and dwarf, and the bottom leaves turned yellow from the tip of the leaves along the edge of the leaves and spread to the upper leaves. Pulling out the diseased plant will reveal that the new leaf sheath of the garlic rhizome has rotted, darkened and sticky granules, and the upper part is accompanied by white or brown granules, which is the sclerotia of the pathogen.
According to the above, the best period for the control of garlic white rot should be started when the ground temperature rises above 6°C. At the same time, a fungicide should be sprayed 2 to 3 days before watering to enhance the resistance of the plant. Sex, inhibition of pathogenic activity, to achieve a multiplier effect of prevention and control. Therefore, the author proposes that in the middle of March, we must step up prevention and treatment 1 or 2 times, and then prevent it once every 2 to 3 days before watering, so as to receive good results. According to experiments, the more effective drug for the prevention of garlic white rot is white rot, the amount of drug used is 90 grams per mu, followed by acetaminophen, and the dosage per mu is 120 to 150 grams. When the above medicaments are sprayed, the garlic will be sprayed mainly on the pseudo stems and on the ground to improve the control effect. At the same time, it can also treat garlic blight. At the time of spraying, the amount of spray should be increased in the area of ​​incidence in past years.
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