Cucumber brown spot disease can also be called Phytophthora sojae, which is mainly a fungal disease caused by Rhizoctonia solani, and is one of the common fungal diseases of crops. The disease is more serious in the spring, and the prevention and treatment should be based on a combination of physical methods and chemical treatment. Next, Xiaobian talked about the symptoms of cucumber brown spot disease, the cause of the disease, and prevention measures, as follows.
First, the symptoms
1. Cucumber brown spot disease is mainly harmful to the leaves, and the central leaves are the first to develop, and then develop downward to form round or irregular round spots.
2, cucumber brown spot disease not only infects cucumber, but also infects tomatoes, eggplants and other fruits and vegetables, eventually causing leaf spots, falling flowers and fruit, seriously affecting the normal growth of crops.
Second, the cause of the disease
1. Cucumber brown spot pathogens overwinter in the soil residual leaves, and will multiply under suitable conditions, and the seeds can be spread by poison.
2. Cucumber brown spot disease can be infested by crop stomata and other means.
3, the greenhouse temperature is the fastest at 10-28 degrees, the relative humidity is more than 85% into the favorable period of disease.
4, high temperature and high humidity in the greenhouse, short lighting time, excessive application of nitrogen fertilizer, crops lack of boron, etc., will cause serious brown spot disease in cucumber.
Third, prevention measures
1. Field management
(2) Handling the broken leaves in the greenhouse in time, and disinfecting the soil such as the shack.
(3) During the planting process of cucumber, it is necessary to ventilate in time to reduce the humidity in the shed.
(4) Use biological bacterial fertilizer more, pay attention to the application of phosphorus and potassium fertilizer, and control the use of nitrogen fertilizer.
(5) After the cucumber is planted, the microbial agents and seaweed essence are applied to improve the disease resistance of the crop itself and enhance the growth of the crop.
(6) Reduce the amount of melons, and increase the number of fruits after the cucumber plants turn better.
2, chemical control
(1) The use of relatively new fungicides, such as fluorobacteria, trifloxystrobin, azole ether, dexamethasone, benzidine, prochloraz, ketone, manganese zinc, bromoxynil, etc., compounded with quinoline copper, spring thunder Bacterial agents such as mycin and Chunleiwang copper are sprayed and controlled.
(2) Pay attention to the rotation of medicine, and timely watering after spraying.
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