Prevention and treatment of gray vegetables

1, a reasonable fertilization. Increase the use of organic fertilizer, do a good job of formula fertilization, pay attention to the application of phosphorus and potassium fertilizer, cultivating strong seedlings, improve the disease resistance of plants.
2, air and light. Keep the shed film clean and increase the light transmittance. Proper close planting, reduced shading, improved lighting conditions, timely ventilation, and reduced humidity in the shed. Keep a high temperature in the morning and prolong the time of exhalation in the afternoon. Increase the temperature at night and especially during the second half of the night to avoid condensation.
3, reasonable watering. The watering option is performed on a sunny day to avoid watering on rainy days, while controlling the amount of watering and minimizing the humidity.
4, according to vegetables before planting, before flowering, flowering, 3-5 days after flowering, young fruit rapid expansion period is the incidence of fungal infection of the buccal cheekbone, the five key periods should be timely medication control.
5, to use different types of drugs alternately, to reduce the resistance of the bacteria, reduce control effect. Different agents were selected before onset, early onset, and mid-onset and were alternately administered. The smoke agent should be used before closing the shed or on cloudy days in the evening, and the chlorothalonil and quick-silver smoke agent can be selected as the smoke agent.

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