Root swelling disease is a soil-borne disease. The pathogens mainly come from the diseased bodies or seeds in the soil (the seeds normally do not carry the bacteria, but there will be dormant sporangia attached to the surface of the seeds to induce infection). The development temperature of the pathogen is 9℃ ～30℃, the optimum temperature is 20℃～24℃, the pathogen can survive in the soil for 5-6 years. Once the pathogen infects the crop, it can form tumor in 8-10 days, and it is relatively difficult to prevent and control after the disease. Pathogens are suitable for survival in acidic calcium-deficient soils, especially when the pH value of the soil is below 6.2, the disease is more serious, and the pH value above 7.2 is not easy to get sick. Bacteria can invade from injured roots, causing root cells to divide and increase in size, forming tumors on the roots, and spreading through rainwater, underground pests, and agricultural operations. The continuous cropping, low-lying, and acidified plots are more serious.
Prevention plan
1. Seed treatment to avoid germs on seeds.
1. Use 55℃ warm water to soak the seeds for 20 minutes, and gradually stir to reduce the temperature of the water to avoid injury to the seeds. 2. Use 0.4% potassium permanganate solution to soak seeds for 15 minutes for disinfection. 3. Use 75% chlorothalonil 600 times solution to soak seeds for 20 minutes for disinfection.
2. Seedbed disinfection can reduce the infection rate of cabbage seedlings.
You can use 10% cyfamidazole 1500 times solution or 72.2 propamocarb hydrochloride 750 times solution, spray seedbeds and seedling trays, and use cyfamidazole or propamocarb hydrochloride or thiram or dixon to water with water to reduce Germ infection.
3. Improve the soil.
According to the habit of bacteria suitable for acidic soil, adjust the soil to weakly alkaline, even if the seeds have disease bacteria, it is not easy to get sick. 1. Avoid continuous cropping and choose non-cruciferous crop rotation. 2. Avoid using compound fertilizers and immature manure to reduce root damage and avoid pathogen infection. 3. Use microbial organic fertilizer or fully decomposed straw manure as base fertilizer to reduce soil salinity and acidification. 4. Sprinkle white ash (150 kg per mu is appropriate) or alkaline substances such as cement on the ground, continuous rotary tillage, and fully mix with the soil to reduce soil acidification. 5. Use carbendazim, thiophanate-methyl, sodium disulfonate, pentachloronitrobenzene, etc. for soil disinfection.
Fourth, strengthen management before and after planting. Rotary tillage and meticulous cultivation before planting to avoid the height of the border block and to prevent the accumulation of heavy water and induce diseases. Before planting, use 50% fluazinam 1500 times solution, or 10% nitrazine 1500 times solution, or 72.2% propamocarb hydrochloride 750 times solution, and mix into mother liquor to spray ditch and spray holes. After planting, use 1500 grams of 50% thiram, or 1000 grams of 50% chlorobromoisocyanuric acid, or 1500 grams of 55% disulfonate to water. According to experience, the application effect of copper sulfate on soil-borne diseases is relatively significant, but the cruciferous family is relatively sensitive to copper preparations and is not recommended.
treatment plan
If plants show obvious symptoms of infection, observe the proportion of wilting plants at noon on a sunny day according to the condition of the disease, and promptly remove the diseased remains and bury them or burn them to reduce the source of transmission. At the same time, the diseased plants that are lighter or non-infected are treated to prevent the abortion. Generally, add rooting agents such as metalaxyl propamocarb, thiophanate methyl, pentachloronitrobenzene, etc. to irrigate the roots.
Cyanofamidazole and fluazinam are the most effective at present, but they are generally not easily accepted by vegetable farmers due to their high cost. You can use 50% fluazinam 1500 times solution, or 10% cyanoxazol 1500 times solution, or 72.2% propamocarb hydrochloride 750 times solution plus rooting agent to irrigate the roots to prevent and control uninfected or relatively light diseased plants , To avoid desperation.
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