The root rot of the scallions is similar to the root rot and is a fungal disease. It is a disease caused by various pathogens such as Pythium, Fusarium, and Phytophthora. The bacteria overwinter in the soil or on the diseased body, becoming the main source of initial infection in the leap year. The pathogen invades from the root or root wound and spreads and spreads through rainwater or irrigation water.
Scallion root rot disease
The radish root rot disease entered the peak period in May, and its occurrence has a great relationship with climatic conditions. It mainly harms seedlings and can also occur in adult stage. In the early stage of the disease, only individual roots and fibrous roots are susceptible, and then gradually expand to the main root. After the main root is ill, the early plants do not show symptoms. After the root rot is aggravated, the function of absorbing water and nutrients is gradually weakened. The upper part of the ground is in short supply due to nutrients. The new leaves first turn yellow, and the light is strong and the evaporation is large before and after noon. At the time, the upper leaves of the plants appeared to be wilting, but they recovered at night. When the condition is serious, the wilting condition can not be restored at night, the whole plant leaves yellow, withered, the root bark becomes brown, and finally the whole plant dies.
Prevention and cure method of radish root rot
Reasonable rotation is the key factor causing root rot disease. Due to continuous planting for many years, the number of pathogenic bacteria in the soil is increased, which is very likely to cause the scallions to be rotted by the disease. Therefore, it is very important to rotate the plots of green onions and other crops, but be careful not to rotate with garlic or leeks.
Controlling soil moisture During the process of planting green onions, if the soil moisture is too large when cultivating soil, it will affect the normal breathing of the roots of the scallions, which will reduce the resistance of the green onions and aggravate the disease. Therefore, in the rainy season, we must pay attention to do the drainage of the field, avoid the accumulation of water and roots, and induce the root rot of the onion.
It is very important to prevent the early stage of prevention by applying biological bacterial fertilizer to the prevention and control of root rot. Before the green onions are cultivated, the biological fertilizer can be applied with water to increase the beneficial bacteria of the soil and inhibit the infection of pathogenic bacteria.
Spraying the drug because the root rot is a bacterial disease and is infectious. Therefore, it is critical to prevent pesticides from being planted in areas where root rot has occurred. Zhang Shuxue advises farmers to use methyl thiophanate and streptomycin sulfate for spraying.
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