Powdery mildew is a common disease in the production of strawberry in protected areas. The disease can occur in the fruits and plants of strawberries. The cold areas and strawberry cultivated in protective fields are more severe. Once it occurs, treatment is not timely, or improper treatment can cause serious losses, and the most serious ones can cause an unacceptable loss. Powdery mildew mainly damages leaves and tender tips, petioles, buds, fruits, and fruits. The strength of the varieties, the level of management, can only make the occurrence of powdery mildew, how fast, slow, and it is difficult to completely eliminate the hazards of powdery mildew.

1. Factors Affecting the Occurrence of Powdery Mildew 1. Planting in successive years, greenhouse soil disinfection does not pay enough attention, and a large number of pathogenic bacteria accumulate: due to the special nature of the construction of solar greenhouses, it cannot be moved, so the problem of replanting in the main producing areas of strawberries is inevitable. Many farmers are raising their seedlings in front of their own sheds, soil disinfection is not complete, or they are not disinfected at all, and there is a large amount of powdery mildew in the soil and surrounding environment; it is difficult for greenhouse crops to conduct crop rotations, which is an important reason for increasing powdery mildew year by year. . 2. The small environment in the greenhouse promotes the rapid development of powdery mildew: the high-humidity environment promotes the rapid development of powdery mildew. After investigation, it has been found that the appropriate temperature is an important factor to promote the development of disease. In winter, when the outside temperature is low, when the grasshopper is opened, it is easy to fog in the greenhouse, and the humidity is very high. If you encounter low temperature, cloudy powdery mildew develops rapidly. (3) The occurrence of powdery mildew was affected by the performance of greenhouse structure and shed film: The heat preservation performance of the back wall of the greenhouse was not high, and the structure was unreasonable, such as the high-span ratio was unreasonable, the temperature of the greenhouse was slow, the interior of the shed was prone to fogging, and the thermal insulation performance deteriorated; Before and after the greenhouse is not properly spaced, the back of the greenhouse is highly shaded by the back wall of the front greenhouse and haystacks. Low light and low temperatures also aggravate the occurrence of powdery mildew. 4. The impact of agricultural operations on the development of diseases: field management directly affects the amount of bacteria and bacteria living environment, we must pay attention to pick the old leaves of fruit, and timely leaves the old leaves, diseased leaves out of the greenhouse, such as overnight in the greenhouse, plus Improper night temperatures have promoted the development of powdery mildew. 5. Large-area planting of low-resistance varieties to promote disease development: In recent years, the introduction of high-quality varieties such as Zhangji, Suiyi women, sweet Charlie, and red cheeks has not been resistant to powdery mildew.

Second, the prevention and control measures 1. Strengthen the field management: the use of plastic film covering drip irrigation technology, when covering the film requires ridge, ditch full coverage, in order to minimize the greenhouse air humidity, to prevent the morning shed fog; timely ventilation, cloudy Also insist on proper ventilation. Using a non-drip anti-fog film to reduce the humidity in the greenhouse; diligently pick up the old leaf disease, and the diseased leaves and old leaves of the day should be cleared out of the greenhouse in time to reduce the source of infection. In the later period, we must pay attention to the removal of excessive leaves and small fruits and fruit, which is a means of effectively suppressing the recurrence of diseases. 2. Pharmacy control: Pharmacy control is an essential and important method, but attention is paid to prevention and treatment in advance. Do not cure the disease before treatment to avoid continuous use of the same kind of pharmaceuticals. Every 7 to 10 days during production, spray protective agent prevention. Strawberry into the flowering period is the most susceptible period of powdery mildew, leaf spraying may cause fruit deformity, so as far as possible in the flowering period do not use pesticide spray, can use sulfur fumigation, usually 5 days fumigation, weather conditions are not Good fumigation can be continuous, if necessary, 400 square meters greenhouse available "Aurora" smoke agent 4 to 5 pieces. In addition, chlorothalonil fumigant can also be used in the early prevention of powdery mildew. Powdery mildew can be used once powdery mildew is confirmed. 400 square meters of greenhouse available fumigant 4 to 5 pieces. 3. The use of Tsui Bei fruit 3000 times, control effect is good and does not contaminate the strawberry fruit surface, to maximize the commodity rate of strawberries. 4. If there is powdery mildew before fruit ripening can be used Yitiande, into the standard (dry suspension agent), Tsuibei plus sulfur powder fumigation to maximize the safety of fruit. 5. Must pay attention to the way to fight drugs: hit the back of the leaves, and to plant a full drug. If there is still remaining liquid, you can spray some on the aisle in the greenhouse.

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