There are various reasons for the occurrence of strawberry powdery mildew in greenhouses, specifically the following aspects: First, the reasons for the variety. Some strawberry varieties are more susceptible to powdery mildew, such as Fengxiang and Lihong. Therefore, in the greenhouse cultivation of strawberries, it is necessary to pay attention to the selection of varieties resistant to powdery mildew. Second, it has been repeated for many years. Repeated cropping caused the accumulation of pathogenic bacteria and toxic substances in the soil, and the physical and chemical properties deteriorated, and powdery mildew occurred seriously. Third, the planting density is too large. In order to pursue high yield, strawberry planting density in greenhouses is generally large.
Some reached 1.3 to 14,000 plants per mu, resulting in poor ventilation and light transmission, so it is easy to develop powdery mildew. Fourth, excessive application of nitrogen fertilizer, insufficient application of organic fertilizer and phosphorus and potassium fertilizer, often lead to plant length, poor ventilation, creating favorable conditions for the occurrence of powdery mildew. Fifth, watering is unscientific. Some growers directly pour large water on the membrane, and some growers are afraid of drought in the shed, pouring water every 7 to 10 days. Excessive and excessive amount of blind watering makes the soil of the greenhouse long-term saturated with water, thus inhibiting the normal growth and development of strawberry roots, and also increasing the internal humidity, which is easy to cause diseases such as powdery mildew.
This article URL: Causes and treatment of powdery mildew in strawberry in greenhouse
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