How to control the brown spot of zucchini

1, select disease-resistant, sterile, coated seeds, uncoated can be soaked in warm water at 55℃ for 15 minutes, germination, sowing. 2. Selecting fields with high dry terrain and convenient irrigation, adopting high ridge cultivation to prevent water accumulation in the field, moisture retention and reducing field humidity are important measures for disease prevention. 3. Strengthen cultivation management, apply fully decomposed organic fertilizer, appropriately increase phosphorus and potassium fertilizer, improve soil fertility, cultivate strong seedlings, reasonably plant closely, enhance plant disease resistance; timely remove diseased branches, diseased leaves, diseased plants, take them out of the field and burn them, apply quicklime to disinfect the diseased holes, and reduce the occurrence of diseases. 4. After harvest, thoroughly remove weeds in the field and surrounding areas, burn or compost intensively; deeply turn and dry the soil to reduce the source of diseases and insects. 5. Reasonable rotation. 6. Chemical control: spray 5% anti-black star or 10% multi-hundred dust agent 1 kg/mu in the early stage of the disease for 3-4 consecutive times. or spraying 600-700 times of 40% metalaxyl copper wettable powder, 1000 times of 50% prohydantoin, 500 times of 50% beideli, 500 times of 64% trimethoprim wettable powder, 500 times of 50% carbendazim and 600 times of 75% chlorothalonil wettable powder once every 7-10 days for 2-3 times continuously. 40% chlorothalonil smoke agent, or 10% fat copper dust agent, or 5% chlorothalonil dust agent 1 kg/mu can be used in rainy days.