After the Fruit has become sick, black spots or dark spots or black reticular lines begin to appear. On rainy days, the lesions rapidly expanded, causing the fruit to turn black and grow into orange-colored conidia and cannot be used as medicine. In sunny days, the lesions develop slowly, the lesions turn dark, and the unaffected areas can still turn red. After flowering, the first petal appears dark spots. The light can still result in the fall of the corolla, and the severe one becomes a black flower. The ovary does not dry up. After the flower buds are infected, black spots or dark spots appear early in the day. In severe cases, they are black buds and cannot be opened. Branches and leaves appear dark spots or dark spots after the disease.
The pathogenic bacteria can overwinter in the diseased fruit, and they can also winterize on the surface of the black fruit. Mainly through the wind and rain to reach the nearby healthy flowers, fruit, buds and other parts, infested the host to carry out the hazards, the temperature played a role in promoting the incidence. From the early fruit period in early May to the final fruit period in mid-October, the disease can be affected by the disease. In the initial period (May to June), the average daily temperature is above 17°C, and the relative humidity is about 60%. There is 2-3 days of rainfall every ten days, and the field can be affected. During the peak period (July-September), the average daily temperature is about 17.8-28.5°C, and the ten-day rainfall is more than 4 days. The average humidity in two consecutive ten days is more than 80%, and the incidence rate has soared. In the later period (from October to the beginning of the frost period), the average temperature in the ten days is 9.2-14.6°C. If there is more than one day of rain in the field, serious diseases will still occur.
The method of prevention and control is to clean up the garden in winter and remove the infected fruit, leaves, branches, etc.; spray 50% of the special wettable powder 600 times dilution; spray 100 times of Bordeaux mixture solution.
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