After the rain has passed, in the event of serious internal disasters, all localities must raise awareness of the seriousness, importance, and urgency of post-disaster disease prevention and control work, establish the idea of ​​disaster reduction and disaster reduction, and regard prevention and control as a post-disaster recovery of production, reconstruction of homes, and production of post-disaster crops. The top priority of the bumper harvest is to focus on the importance of “leadership, technology, capital, and materials†and avoid fortunate psychological and paralysis ideas. In conjunction with local conditions, the disease monitoring and prevention and control work should be done in accordance with local conditions. The specific measures are as follows:
Maize large spot disease 1. Increase the application of phosphorus and potassium fertilizers. Remove the bottom 2 to 3 leaves, reduce the relative humidity in the field, make the plants robust and increase resistance to disease. 2. Chemical control: Spray 50% carbendazim WP 500 times or 50% thiophanate-methyl WP 600 times, 75% chlorothalonil WP 800 times, 10 days apart. One-time, continuous control 2 to 3 times.
S. sclerotiorum 1. To conduct field inspections in time to find diseased plants and to remove diseased plants in a timely manner. 2. Chemical control: When the disease area is large, not only must it be sprayed around the diseased plant, but it must be sprayed on the field to protect the plant. Or use a self-propelled high-rod sprayer to spray medicines. Available 50% procymidone, 40% sclerotin, 25% prochloraz, 50% iprodione, 1.5 kilograms per hectare, water spray, once every 7 days.
Autumn cabbage soft rot 1. Strengthen field management. Drain the water immediately after the rain, so that no water can accumulate in the ground. Reduce wound production and promote wound healing. 2. Chemical control. For the onset of disease prevention should be timely, available streptomycin sulfate or streptomycin 1000 to 1300 times; or neophytin 1300 times spray. Focus on spraying soft rot disease strains and surrounding vegetables or petiole, so that liquid medicine flow into the heart of the cabbage, the better.
Autumn cabbage virus disease 1. Strengthen management, clean the pastoral. First of all, thoroughly remove the weeds in the field. Secondly, the diseased plants were promptly removed and taken out of the field and buried or burned. To increase phosphorus and potassium fertilizers. It is also necessary to top-dress fertilizers in a timely manner. Nitrogen fertilizers have to be done in small quantities for many times before they are less and many times less. When thinning, we should remove weak diseased seedlings. 2. Chemical control: The virus A WP 500 times, 20% virus net 500 times, 5% virus water 500 times and other agents spray, spray evenly every 5 to 7 days, even spray 2 ~ 3 times.
Autumn cabbage downy mildew 1. Strengthen management: First, prevent the accumulation of stagnant water in the field; Second, pay attention to irrigation and drainage, and timely irrigation in drought, especially in the water-supply period, but timely drainage in rainy season. 2. Chemical control: 75% chlorothalonil wettable powder 600 to 800 times liquid, 25% Rhodoxyprus wettable powder 800 to 1000 times liquid, 65% dexamethasone wettable powder 400 to 500 times liquid Alternate use, spray evenly every 7-10 days, even spray 3 or 4 times, can receive obvious control effect.
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