Onset of disease: The pathogens in the seeds or in the soil with the sick body overwintering. Invasion through wounds or pores, water holes, and lenticels, spread through rain, water, insects, and condensation after onset. The growth temperature of germs was 1-35°C, suitable temperature for development was 20-28°C, growth was stopped at 39°C, and death was at 49-50°C. High air humidity, or rain, or condensation at night is more conducive to disease.
Prevention:
1. Use disease-free seeds, soak seeds with new high-fat film before sowing, so as to keep warm, moisturize and absorb, increase seed germination rate, and make seedlings robust. Repel underground pests and isolate virus infections. Can also be mixed with seed coating agents.
2. Use disease-free soil to raise seedlings. After pulling, remove defoliant defoliant and non-melon crops for more than 2 years.
3. Reasonable watering to prevent flooding. Flooding and dehumidification should be paid attention to in the protection area, and the time for condensation on the surface of the plants should be shortened. Attention should be paid to agricultural operations after the dew has dried to prevent and control field pests in time.
4. Chemical control. In the early onset of the disease, the new high-fat membrane and local targeted medicaments can be sprayed in a timely manner. The new high-fat lipid membrane can improve the efficacy and form a layer of polymer membrane, so that prevention and treatment can be combined.
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