Causes and symptoms
The pathogenic fungi of strawberry gray mold are transmitted through wind and rain, agricultural operations, etc. Room temperature and humidity are the main factors of the disease. The disease can occur in petiole, leaves, buds, flowers, stalks and fruits after flowering in strawberry, and the most serious is the incidence of fruit. When the onset of the leaves, a brownish watery spot develops. When the humidity is high, white villous mycelium appears on the back of the leaves. Petiole and pedicel become brown after infection, lesions often surround the petiole, pedicel, and finally wilting and dry. The appearance of the fruit appeared pale brown spots, and as the spots expanded, the whole fruit became soft and the fruit became gray moldy.
Control methods
It is necessary to prevent the occurrence of Botrytis cinerea in strawberry by selecting disease-resistant varieties for disease prevention.
Controlling the Humidity in Sheds Because of the high humidity environment, it is a breeding ground for gray mold in strawberries, so controlling the humidity in greenhouses is crucial.
Ventilated greenhouses should be well ventilated to reduce the humidity in the field. On sunny days, the sun should be open for ventilation.
Rational irrigation control watering, before and after flowering, watering, watering can not be too much, after the pouring of moisture in a timely manner.
To control the density of planting density should not be too large, it is necessary to prevent the poor ventilation and light transmission of strawberries due to excessive planting density.
Removal of diseased fruit leaves often removes rotten fruit, sick old leaves, brings them out of the shed, buries them deeply or burns them, centralizes them to prevent the bacteria from re-infesting them.
The use of pharmaceutical agents for the treatment of gray rot agents, spray control. After watering, after the rain, when the relative humidity of the air is high, it is necessary to spray and prevent the disease.
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