For the control of broccoli black spot, it is best to choose the disease-free zone to keep the seed, or to leave the seed on the disease-free seedlings to prevent the seeds from contaminating. Before sowing, use a temperature of 55°C for soaking and soaking for 20 minutes. Immediately move into cool water and cool. Allow to dry after sowing. Can also be used seed weight 0.4% of 50% iprodione WP, or 50% thiram wettable powder, 50% mancozeb wettable powder and other seed dressing, to destroy the bacteria carried by the seeds.
During the growth of broccoli, prevention should be the main method and medication should be used in time. In the premorbid or early onset, 50% iprodione WP can be used 1000-1500 times, or 58% metalaxyl MnZn wettable powder 500 times, 50% ethidium sulphide wettable powder 1500 times. , 43% tebuconazole gum suspension 5000 times, 70% mancozeb wettable powder 500 times, 75% chlorothalonil wettable powder 600 times, 50% procymidone wettable powder 2000 times, 40% sterilization Dan WP 400 times, 2% pyrimidine nucleoside antibiotics 100 mg / liter spray control, 7 days once, and even spray 2-3 times. Since the fleas can promote the spread of the disease, insecticides should be added when spraying.
Protected cultivation, can spray 5% chlorothalonil dust agent per acre 1 kg, once every 7-10 days, even spray 2-3 times, can also be used 45% chlorothalonil smoke agent or 15% procymidone smoke agent 200 -250 grams, closed smoke for 6-8 hours, once every 7-10 days, once smoked 2-3 times.
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