Prevention of black rot in cauliflower
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1. The symptoms of the disease. 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.
2. Control measures. 1 seed disinfection. Select disease-free seeds for seeding, soaking in 50% warm water for 20 minutes, or soaking for 15 minutes with 50% dexamethasone 200 times solution, or soaking for 2 hours with 1000 times streptomycin solution, washing and drying . 2 bed soil disinfection. For every 1 square meter of seedbed, use 40% pentachloronitrobenzene powder 8g, 40% omeprazole WP 8~10g and appropriate amount of fine dry soil and mix well. Spread 1/3 to the surface and leave 2/3. Used to cover the seeds when planting. 3 rounds change. Severe disease and non-cruciferous crops for 2 to 3 years of rotation can reduce field disease. 4 control pests. Timely control of pests such as Plutella xylostella, Pieris rapae, Beet armyworm, aphids, cockroach leaf beetles and mantle, in order to avoid transmission of diseases. 5 Strengthen management. Timely sowing, appropriate seedlings; timely drainage after rain, to prevent excessive soil moisture, excessive drought; strengthen field management, rational fertilization, and promote robust growth of plants in order to improve disease resistance. 6 clean the pastoral. After harvesting cauliflower, remove the roots and leaves in time, and bring them out of the fields to be deeply buried or burned: deepen the soil, make the field dry, and reduce the bacteria source. 7 pharmaceutical control. In the early stage of disease, available agricultural anti-751 water agent 100 times liquid or Feng Ling 200 times, 14% network ammonia copper water agent 400 times, 77% can kill WP 500 times, 50% SON Zinc 600 times liquid Spray any one of them; or spray it with 50% Daisen ammonium solution 1000 times, 72% agricultural streptomycin soluble powder or neomycinse 4000 times, spray once every 7-10 days, even spray 2 ~ 3 times. Severe disease field as the disease progress can be increased appropriately the number of spraying. (Author: Wu Zhigang Neo Unit: Forestry College of Horticulture, Southwest Agricultural University)