Inquiries: I am a farmer in Suizhong. Will this be treated with sclerotinia?
Answer: First, the symptoms of damage
Generally more symptoms appear on the stem first. At the beginning of the disease, there appeared pale brown spots on the stalks. Look carefully at the upper side with unobtrusive ring veins, and the surface has white flocculent mycelia or white particles. (ie, spores and sclerotia of pathogens). In severe cases, the cortex rots and the whole plant withers. The stems are hollow and there are many murine sclerotia in the stem. Withered plants, the white sclerotia outside the stem also turns black and is easily detached.
Second, the incidence conditions
The temperature of the bacteria is not strictly required. Ascospores can germinate at 0-35°C, but the optimum temperature is 15-20°C, and the optimum humidity is about 99%. In the shed, low temperatures and high humidity often cause disease.
Third, prevention and control technology
1. The rotation is down. Where the disease occurs, it should be carried out for 2 to 3 years with non-solanum and celery vegetables.
2. Strengthen the temperature and humidity control. Please pay attention to venting moisture within the shed. After onset, the night temperature in the shed can be appropriately increased to reduce condensation and reduce disease.
3. Select seed, film. The sclerotia can be mixed in the seeds for long-distance transmission. Therefore, the diseased plants cannot be selected for fruit retention. Seeds should be sifted before sowing, eliminating sclerotia mixed in them. And take the mulching cultivation to prevent the ascidian plate from unearthing.
4. Deeply turn the land. Before the planting, the land should be deep-turned over 15 cm, turning the surface sclerotia into deep layers and watering in time.
5. Chemical control. In the early stage of disease, 15% of fast smoke (Putomycin) smoke can be used to smoke 225g/mu, smoke once every 10 days, 3~4 times in a row can be better controlled. Can also be used 40% sclerotium net WP 1000 times, 50% carbendazim WP 500 times, 50% sulfacin WP 1500 times, 50% DF WP 500 times or 50% Due to 1000 times spray control of wettable powder, every 7 to 10 days, continuous use of 3 to 4 times.
6. Completely remove the sick body. Field diseased plants and fruit drop, diseased leaves and diseased flowers should be promptly brought to the destruction outside the shed.
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