The root rot of garlic is caused by bacterial infection. After the plant infects the bacteria, the primary roots rot from the root tip to the base, and the roots are successively rotted. Some plants are rotted together with the garlic, and there is a foul smell in the rot, which easily causes the mantle and other parasites. Sexual pests. The leaves of the diseased plants are chlorotic and yellow, and the soft rot is along the leaf veins from the tip of the leaves. The plants are short and the growth and development are dysfunctional. In severe cases, the plants die. In the spring, the dryness of the tip of the garlic appeared in a large area. It was related to the local sowing of garlic after the corn was harvested. The root rot bacteria in the soil accumulated over the years, leading to serious root rot. The tip is dry. To prevent the dryness of the tip of the garlic in the spring, it is necessary to disinfect the soil before the garlic is planted. Generally, in September, the garlic is deep-turned for one month before the sowing of garlic, and the depth of ploughing is not less than 20 cm. Shallow the soil before sowing, and apply the lime, biological fungicide, fungicide , carbendazim to disinfect the soil. Mixing garlic with chemicals can prevent the occurrence of garlic root rot. For every 100 kilograms of garlic cloves, use 77% of the canine wettable powder of 150%, add 8 kg of water to evenly spray the garlic, dry it and sow it; or mix it with copper preparation such as cuprous oxide. Root rot occurs in the growth period of garlic. It can be sprayed or irrigated with 40-90 ml of water and 40-60 kg of water per acre in the early stage of the disease; or sterilized per acre (50 % chlorobromoisocyanuric acid wettable powder) 30-60 g plus water 50 kg spray or root irrigation, prevention and control once every 5 days, continuous control 2 to 3 times. Plants that are seriously ill and dead plants should be removed from the field in time to prevent the spread of disease . In addition, the implementation of rice rotation can prevent root rot and other soil-borne diseases.
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