Prevention of Flower Diseases in Spring

Spring is an important stage for flower sowing and seedling raising. With the warmer weather and higher temperature, diseases and insect pests are about to enter a high incidence period. The quality of seedlings determines the quality of finished flowers in the future, so the prevention of diseases and insect pests in spring is particularly important.

In March and April, flower production in northern China is generally still in greenhouse facilities, but at this time enterprises have gradually reduced the temperature in the facilities, but the humidity is still very high, prone to the outbreak of fungal diseases such as gray mildew and downy mildew. The best way to prevent it is to ventilate and dehumidify in time when the weather is good, or to use drugs such as chlorothalonil containing pyrimidine cyclamines for protective sterilization. If it is found that some plants have been infected with the disease, chemical reagents containing nitriles such as "Huiyou" should be used to control the disease.

In addition to the above diseases may occur in southern flower production, flower seedlings are easy to grow because of high temperature and humidity, and stems are often affected by some soil-borne diseases, such as quenching, blight and other diseases. To prevent these diseases, you can directly pour a "potion" containing fungicides during the first watering, or mix the substrate or soil with fungicides during sowing.

In addition, in the aspect of physical control, the humidity in greenhouse should be controlled as far as possible to avoid water droplets attached to plant leaves for a long time. Sprinkler irrigation or sprinkler watering is best done in the morning so that the droplets on the plant dry before evening. Use a culture substrate with good drainage and avoid over-watering, otherwise it will lead to root rot. Try not to mix the substrate with the soil, as most of the soil contains bacteria that cause plant root rot.