How to prevent and cure rotten head disease by planting sunflowers?

How to prevent sunflower rot disease? Please describe the method of sunflower rot head disease hazards: Symptoms and conditions of the disease from emergence to maturity can be disease, stem disease mostly in the base, the formation of water-soaked spots, humidity when the spots grow white hyphae, so that the stem fragile easy to break, and finally the whole plant died. The flower disc at the end of florescence is susceptible to this disease. Brown water-soaked spots appear on the back of the flower disc when it occurs. When it rains, it spreads rapidly, penetrates the flower disc, grows white hyphae, and makes the whole flower disc soft and rotten. Sclerotinia sclerotiorum overwinters on the ground and usually develops heavily under wet soil, low temperature and continuous cropping conditions. Sunflower rotten head disease control methods: 1. Implement rotation, not with legumes, solanaceae and other crops, but with gramineous crops, and keep a certain distance between planting plots and previous sunflower fields. 2. Choose disease-resistant varieties and increase phosphorus and potassium fertilizer to improve disease resistance. Sowing late at the appropriate time, the sowing date moved to late May, so that the flowering period staggered rainy season. Sclerotinia sclerotiorum can be buried under 7 cm of soil layer by deep ploughing to reduce the occurrence of rot head disease. 3. Remove the diseased plants in the field, pull out the diseased plants during the growth period, burn them or bury them deeply in the soil; after harvest, the residues of the diseased plants should be picked out and burned in the field. 4, seed treatment, soak with 60℃ hot water for 10 - 20 minutes, can also be used 50% clean sclerotium according to the seed weight of 0.5% of the dose dressing. Spray at flowering stage, spray 50% Sclerotium 500 times solution or 50% procyclidine, 50% ethylene Sclerotium 800 - 1000 times solution, spray 2 - 3 times continuously at late flowering stage, spray once every 7 days. Click for more sunflower cultivation technology Click for more food crop cultivation technology