Prevention and Cure of Bacterial Wilt of Summer Cucumber
In May of this year, cucumbers in many places had a new disease. At the early stage of disease, dark green spots were found on the leaves and stems. The stems became thinner and the ends were water-stained. The vines and leaves above the diseased part first appeared withered. To further develop, the whole plant quickly withered to death. Symptoms are similar to the epidemic after onset, but the fungus-killing drug does not work. The stem is opened and squeezed by hand. White fungal pus flows from the vascular bundle. This is different from the disease. Vascular bundles do not change color and are different from fungal wilt disease. Therefore, methods used to control fusarium wilt also do not work. After the onset of infection is extremely rapid, due to improper control methods, serious harm.
The disease is a new disease of cucumber - bacterial wilt disease, a bacterial disease, spread by cucumber beetles. The control method is as follows.
1. Seed disinfection. The seeds were collected from disease-free strains and the seeds were sterilized by dry heat at 70° C. for 72 hours, or soaked in warm water at 50° C. for 20 minutes, and the seeds were picked out after cooling. Pharmacy disinfection methods: 40% formalin 150 times liquid soaking for 1.5 hours; or 1 million units of 500 times streptomycin sulfate soaking for 2 hours, rinse germination after germination.
2. Rotation. In the field of disease, non-guatem crop rotations were carried out for more than 2 years.
3. Use disease-free Daejeon soil to prevent seedling disease.
4. Field management. Strengthen field management, increase organic fertilizer, do not apply nitrogen fertilizer. During the growing period, once every 20 days, one ten-thousandth of a natural alizarin, Shuofeng 481, is sprayed to promote growth and improve disease resistance. After pulling, the stubble leaves are transported out of the field, buried or burned to reduce the pathogen.
5. Prevent pests in a timely manner and reduce the route of infection.
6. Chemical control. Spraying at the early stage of disease: 4000 times of streptomycin-soluble powder for 72% of agricultural use, or 300 times for 14% of ammonia solution, or 600 times for 50% of methorus copper wettable powder. Since the disease is often accompanied by an epidemic at the time of onset, a 600-fold solution of 72% Kelu wettable powder was applied alternately. Once every 7-10 days, spray 3-4 times.
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