Botrytis cinerea is one of the main diseases of strawberry cultivation in greenhouses. It mainly infects fruits, pedicels and petioles. Fruit is the most important and it has a great influence on the yield and quality of strawberries. How to correctly control strawberry gray mold in greenhouses?
I. Causes and Symptoms
The pathogenic fungi of strawberry gray mold are transmitted through wind and rain, agricultural operations, etc. The high humidity in the greenhouse is a major factor in the pathogenesis. After the strawberry blossoms, the disease can develop on petiole, leaves, buds, flowers, stalks and fruits. The most serious problem 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.
Second, control methods
1, selection of disease-resistant varieties
It is necessary to prevent the occurrence of Botrytis cinerea in the selection of disease-resistant varieties.
2, control the temperature and humidity within the shed
Because the high humidity environment is a breeding ground for gray mold of strawberry, it is very important to control the humidity in the greenhouse.
3, more ventilation
The greenhouse must be well ventilated to reduce the humidity in the field. On sunny days, the sun should be open for ventilation.
4, reasonable irrigation
Control watering, before and after flowering, watering, watering can not be too much, after the pouring of moisture in a timely manner.
5, control density
The planting density should not be too large, and it is necessary to prevent the poor ventilation and light transmission of the strawberries due to excessive planting density.
6, remove sick leaves
Frequently removing rotten fruit, sick old leaves, bringing them out of the shed, burying them deep or burning them, and centralizing them to prevent the bacteria from re-infecting them.
7, using the drug
The agent used to treat gray rot was sprayed and prevented. After watering and after rainfall, spray the medicine and prevent disease when the relative humidity of the air is high.
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