Bacterial black rot is one of the major diseases of cauliflower. The disease has a wide range of hosts and can also harm various cruciferous vegetables such as cabbage, cabbage, rape, mustard and radish. Heavy ploughing, frequent rains, partial application of nitrogenous fertilizers, and severe disease infestations are serious.
First, the symptoms
During the seedling stage, the cotyledons became immersed and gradually browned, withered and spread to the true leaves. The veins showed small strips of varying lengths; the onset was heavy during the ripening period, and the main damage was cauliflower leaves, which spread inward from the leaf margins. "V"-shaped yellow-brown lesions with blackened posterior veins, black rot on leaf margins, yellow halos on the edges, and spread to stems and roots, causing vascular bundles on stems and roots to turn black, and flower balls appearing gray and black. Corruption, severe plant death.
Second, prevention and control measures
1 Seed disinfection: Select disease-free seeds for seeding, soaking in warm water at 50°C for 20 minutes, or soaking for 15 minutes with 200 % solution of 50% dexamethasone, or soaking for 2 hours with 1000 times streptomycin, washing and drying Can be sowed; 2 bed soil disinfection: every 1 square meter with 40% chlorobenzene nitrobenzene powder 8 grams, 40% DM US 8-10 grams wettable powder and the amount of fine dry soil mix, first 1 / 3 Sprinkle on the pods, leave 2/3 seeds to cover the seed, and 3 rounds to change the pods: 2-3 years of rotation for serious disease and non-cruciferous crops can reduce field disease; 4 Control pests: Promptly prevent and control pests such as Plutella xylostella, Pieris rapae, Beet armyworm, Aphids, Locust leaf beetles, and mantle, so as to avoid transmission of diseases; 5 Strengthen management: timely sowing, appropriate seedlings; timely drainage after rain, prevent soil moisture and drought; strengthen Field management, rational fertilization, and promote robust growth of plants to improve disease resistance; 6 clean garden: broccoli harvest, timely removal of roots and leaves, and brought out of the field buried or burned: deep soil, land preparation, reduce Fungi source; 7 Chemical control: early onset, may Agricultural anti-751 water agent 100 times liquid or Feng Ling 200 times, 14% Luo ammonia water agent 400 times liquid, 77% can kill WP 500 times, 50% 250 times d Spraying; or using 50% of Daisen ammonium aqueous solution 1000 times, 72% of agricultural streptomycin soluble powder or neophytin 4000 times, spray once every 7-10 days, and spray 2-3 times. Severe disease field as the disease progress can be increased appropriately the number of spraying.
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