How to control diseases in cherry tomato seedling stage?

What diseases does cherry tomato have at seedling stage? How to control diseases and insect pests in cherry tomato seedling stage? Also ask experienced netizens to help introduce the diseases that will occur at the seedling stage of cherry tomato, such as quenching disease, standing blight, root retting and late blight, which often lead to symptoms such as death and lodging of cherry tomato seedlings, so the planting network collates the symptoms and control methods of the above diseases, which are listed in detail for netizens' reference. First, cherry tomato seedling stage symptoms of sudden disease: the disease commonly known as "small foot plague" only occurs in the seedling stage. At first, the water-immersed spot appeared at the base of the stem of the seedling, and then gradually turned yellow, and then the diseased part was constricted into a linear shape. After the disease of a small number of seedlings, the bacteria spread around, causing the seedlings to lodge. When the humidity of the seedbed is high, white mildew is easy to be produced in the disease part and soil, and the disease part of the diseased seedling is often clung to soil. Second, the symptoms of cherry tomato seedling blight: the disease is also called dead seedling disease, and the disease is serious in the middle and later stage of seedlings. The stem base of the damaged seedlings produced oval dark brown disease spots, and the early diseased seedlings wilted during the day and recovered at night. When the disease is serious, the disease spot gradually sunken, causing the seedlings to die but not lodging, the disease part has concentric wheel lines and does not grow white cotton flocculent mold, which is the main feature different from sudden fall disease. Third, the root retting symptoms of cherry tomato at seedling stage: the retting root is mainly no new root after the young stem is unearthed, the leaf color becomes pale and yellow, the leaf wilts, the leaf margin is scorched, the root bark is rusty and rotten, and the whole plant is easy to pull up. 4. Symptoms of late blight in cherry tomato seedling stage: after the disease, the young cotyledons of cherry tomato appeared flooded dark green disease spots with obvious mildew layer on the edge, and the disease spots spread rapidly to the main stem, making the stem thinner and dark brown, causing the whole plant to wilt or fall down, and sparse white mildew appeared on the surface of the diseased part when the humidity was high. Prevention and control methods of cherry tomato seedling diseases: method 1. The setting of seedling bed: the seedling bed should be built in a place with high terrain, sunny ventilation and good drainage. The bed soil should choose the field soil that has not planted eggplant fruit in the previous crop, and the best former crop is onion and garlic. If the old bed soil is used, it should be disinfected, the bed soil should be fully turned over before sowing, and the organic fertilizer should be fully mature. Method 2. Management of seedling bed: the seedling bed should keep warm to prevent cold wind or low temperature from invading, and the bed temperature should not be lower than 20 ℃ during the day. In case of low temperature in cloudy days, the soil can be loosened to reduce humidity and increase temperature, promote root growth, and turn sunny after continuous overcast, so ventilation should be strengthened. Remove the diseased plant immediately and sprinkle it with fine dry soil or plant ash. Method 3. Soil treatment of seedling bed: the old seedling bed was used to raise seedlings, and the bed soil should be disinfected. Rake the bed soil 15 days before sowing, use formalin 120ml to water 3-9kg (the amount of water depends on the dry humidity of the seedling bed), uncover it with plastic film cover for 4-5 days after pouring, and wait for sowing after 10 days; it can also be sown with 50% carbendazim wettable powder 10g or 70% methyl thiophanate wettable powder 10g, fine dry soil 1kg mixed well, and put on the cushion cover during sowing. It can also be sown in 1m2 seedbed with 10g dimethazone powder mixed with fine dry soil in 1kg ditch or hole application. Method 4. Disinfection of cherry tomato seeds before sowing: soak the seeds in 50 ℃-55 ℃ warm water for 10-15 minutes, or 0.3% potassium permanganate for 20-30 minutes, and mix the seeds with 50% carbendazim wettable powder and 65% mancozeb wettable powder. Method 5. Chemical control: 50% metalaxyl manganese zinc wettable powder 500 times or 72.2% Purek water 600 times spray can be used to control the disease of cherry tomato seedlings. The seedling blight of cherry small tomato can be controlled with 1000 times of 70% methyl topiramate wettable powder or 1500 times of Jinggangmycin water. Spray every 7-10 days, depending on the disease can be prevented 2-3 times. If the humidity is too high, you can also use 30 g of 20% Miaomiaoduo wettable powder mixed with fine dry soil 4-5kg, choose a sunny day at noon to spread evenly on the seedbed, the effect is ideal. Cherry tomato seedling late blight can be controlled with 58% Redomir wettable powder 500 times and 72% DuPont Kelu 600 times. Spray every 7-10 days, depending on the disease can be prevented 2-3 times. How to grow Cherry Little Tomato the planting environment of high yield cherry tomato