At present, cabbages have been sown in succession, and preparations for preventing various diseases of Chinese cabbage should be done to avoid unnecessary losses. In our city, the main diseases of autumn sowing cabbage are downy mildew, soft rot and viral diseases. 1. Downy mildew: Outburst disease is the formation of a large number of polygonal lesions on the foliage. The diseased part grows white mould when there is high humidity or dew, or forms a polygonal lesion. In severe cases, the lesions increase and the leaves become yellow and dry. Very serious. Control methods: The first is appropriate late broadcast; The second is spray protection, spraying the protective agent such as 80% mancozeb WP 1000 times during the period from rosette to heading; The third is active treatment, after the emergence of the central disease strain began to spray 58% metalaxyl MnZn WP 500 times. 2, soft rot: also known as collapsed, off the state, from the rosette period to the heart of the package period, the incidence of immersion was slightly yellow lesions, and gradually expanded was pale yellow or tan and rot, and issued a bad smell. Control methods: Spraying Fengling (Bacillus subtilis) from the seedling stage to the lotus stage, 100-150 g per mu, watering 50 kg, or digging into the roots with 150-250 g of water and 100 kg of water. Spray 72% wettable powder of streptomycin sulfate 3000-4000 times, or neophytin 4000 times, or 47% Garrinone wettable powder (Spring copper chlorine dioxide;) 800 times, 53.8% can kill 2000 dry suspension agent (copper hydroxide) 1000 times every 10 days, continuous control 2 to 3 times. 3, viral diseases: cramps, mosaics, shrinkage, necrosis, malformations and other symptoms can occur. Control methods: On the basis of control of aphids, spraying 2% bacillus gram agent (Ningnanmycin) 300 times solution, or 20% virus A WP 500 times solution, or 1.5% phytosanitary disease No. II emulsion 1000 times, or 83 booster 100 times, every 10 days, even spray 2 or 3 times.
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