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Occurrence and prevention of cucumber blight
I. Hazard symptoms
From the seedling stage to the adult stage, you can get sick. When the seedlings became infected, they began to appear dark green, water-soaked and rot on the tender tip, and gradually dried up to form a bald tip. The adult stage mainly endangered the base of the stem and the branch of the tender stem. It began to be dark green water-immersed, and then became soft and obviously collapsed. The leaves above the diseased part gradually withered. The leaves are damaged to produce dark green water-immersed lesions, which gradually enlarge to form large round lesions. The melons are murdered, producing dark green, water-immersed, nearly circular depressions. In the later stage, the disease ministers sparsely grayish white mold layers, the diseased melons shrink, soft rot, and have a stench.
Second, the occurrence of the law
The disease caused by fungi, the disease with the disease in the soil, manure or attached to the seeds overwinter, mainly by rain, irrigation water, airflow. The disease has a short onset cycle and is rapidly prevalent, and is prone to prevalence under conditions of high temperature and high humidity. The incidence of heavy rainy days is heavy. The rainy days last for a long time, and the rainfall is large, the disease is early and the disease is heavy.
Third, the prevention and treatment method
(1) Select resistant varieties.
(2) Rotation with non-melon crops for more than 5 years.
(3) Grafting and disease prevention.
(4) Soil treatment. Commonly used soil treatment agents in seedbeds or greenhouses are: lime nitrogen, must-kill, cotton, dikes, carbendazim, acesulfame, metalaxyl, and carbaryl.
(5) Seed soaking, germination can be carried out after soaking for 7 hours with 72.2% Plex water 800 times solution or 25% metalaxyl WP 800 times solution.
(6) Strengthen field management and improve the disease resistance of plants. Rational fertilization (especially nitrogen fertilizer) should be applied to improve the light transmission intensity, timely drainage and drainage, and reduce the field temperature.
(7) Chemical control. Before the onset or before the rainy season, spray a protective fungicide, such as 96% carbendazim powder 3000 times solution, 70% propionate zinc wettable powder 800 times solution.
In the early stage of the disease, the central diseased plant was removed in time, and the drug was sprayed and controlled. The selected agents were: 66.8% mildew or 72% cream urea manganese zinc wettable powder 800 times liquid, 25% azoxystrobin suspension 1500 times liquid, 40% Aluminum triethylphosphinate 400 times solution.
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