How to Prevent Gray Mold in Pumpkin Seedlings
1, the characteristics of the disease
The disease mainly harms flowers and fruits. The damaged flowers and fruit were water-stained at the initial stage, gradually softened, and the surface of the affected area was covered with gray-green moldy material.
It eventually leads to the decay of flowers and fruits. Late diseased parts sometimes grow black sclerotia.
2, the incidence of the law
The pathogen is the semi-known Botrytis cinerea. Pathogens overwinter on sicknesses and they can also survive in the soil and spread through the airstream. The pathogenic bacteria prefers high-humidity and low-temperature conditions, the optimum temperature is 18-23°C, relative humidity is above 90%, and low light is suitable for disease. Conservation cultivation, winter and spring even more cloudy days, low temperatures, coupled with high density, poor ventilation and light, humidity, so the incidence is heavier.
3, control methods
(1) Strengthen field management. Clean up the sick and keep the field clean, control the spread of germs, and control the temperature.
(2) Underwater irrigation or drip irrigation is used for watering, and the humidity at night should be less than 80%. When the humidity is high, measures should be taken to reduce the humidity.
(3) The old leaves should be promptly cleaned up in the later period of production to increase ventilation and light transmission, so that the plants grow robustly and increase the resistance to diseases.
(4) Chemical control. With 50% acetaminophen WP 1000-1500 times, 50% mancozeb WP 400 times, spray every 6-7 days, even spray 2-3 times.
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