How to prevent leek disease
The leek disease is a fungal disease caused by P. infestans infection. Once the disease occurs, the disease is rapidly spread and the disease spreads quickly. When it is serious, it will destroy the whole field and cause serious economic losses to the vegetable farmers. Epiphyseal and pathogenic parts of leek plants can be affected, especially pseudostems and bulbs. The disease is caused by wind and rain, irrigation water, and shed film dripping water, causing reinfection. The optimum temperature for pathogenic disease is 25-32°C, and the relative humidity is above 90%. During the cultivation of roots in the open field, the leeks are severely affected when there is heavy rain or rainfall.
Agricultural control: During the period of raising the roots in open field, the water should be drained in time after rainfall, and the air should be scattered and wet. Fertilizer should be careful not to excessively apply nitrogen fertilizer, and the planting density should not be too large, so as to avoid the delicate leek plants and poor disease resistance. When watering, it is necessary to pour small water and prevent flooding. Shed room should be ventilated and dampened in time.
Chemical control: In the early stage of onset, the drug should be sprayed in time. The agent can be used with 25% metalaxyl wettable powder 750 times, or 58% metalaxyl manganese zinc wettable powder 500 times, or 64% antivirus WP Liquid, or 77%, can kill WP 500 times, or 80% WP WP 600 times, or 90% INS, WP 700 times. Once every 7 days, spray 2-3 times. Can also be used copper sulfate 500-1000 times, 25% metalaxyl wettable powder 1000 times irrigate.
Flavone Series,Flavone Intermediate,Flavone Api,Di-Substituted Flavones
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