The first is squatting disease. Continuous cloudy rain is the most likely cause of this disease. This disease is serious to tomato seedlings. Generally, after the seedlings are unearthed, they are infected by pathogens, causing water-stained lesions at the base of young stems. The stem expands and gradually shrinks into a thin line. The seedlings fall on the ground due to the loss of support. When the humidity of the seedbed is too large, white cotton-like hyphae will be produced on the sick seedling or seedbed. The general method of prevention and control is to avoid the occurrence of low temperature and high humidity, to release the wind in time, and not to water in the rainy days. After the disease is in the seedling stage, it can spray 72.2% of the Pulk water agent 400 times, and spray 2~3 liters of the liquid solution per square meter. It is also possible to use 60% fluoromanganese zinc (killing) wettable powder 800 times.
The other is the blight, when the seeding is too dense or the seedlings are not timely, the temperature is too high will cause the disease, the specific symptoms are also in the base of the stem, the color becomes brown, the diseased part shrinks fine, the stems and leaves are wilting, the most obvious The symptoms are that the seedlings are wilting during the day and recover at night. When the lesions are around the stem for a week, the seedlings gradually die and do not fall. After discovering this symptom, it should be promptly prevented. In the early stage of the disease, 20% methyl chlorpyrifos EC 1200 times or 95% carbendazim 3,000 times solution can be sprayed. Depending on the condition, it is once every 7 to 10 days, 2 to 3 times in a row.
The root disease is also occurring in the nursery stage. After the planting, the seedlings do not grow new roots, the surface of the young roots begins to rust brown, then gradually decays, the leaves turn yellow, the severe wilting is dead, and the seedlings can be easily pulled up. After the disease occurs, it is necessary to loosen the soil in time to increase the permeability of the soil layer, or spray the plant growth regulator to increase the plant disease resistance. (Ming Wenwen)
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