Reasons for abnormal analysis of watermelon stems in greenhouse
From the occurrence of the whole shed, the cracks on the stems are not caused by the infection of the vine, but because of physiological problems, the main reason is the excessive control of the watering before the watermelons are Large temperature difference between day and night in the shed.
Generally, vegetable farmers will properly control the water before and after the flowering of the watermelon so that the flower can be pollinated normally. When the melon is sitting, the water is poured. During this time, the soil moisture is often difficult to control. In addition, the current temperature difference between day and night is large, the night temperature is less than 10 ° C, and the temperature in the arch shed can reach 30 ° C or more during the day. In this environment, the stem vines expand rapidly after watering suddenly, just like a cracked melon. The cells in the stems grow faster than the stems of the stems, so there is a lot of splitting. After the splitting, the crack is very susceptible to infection by the bacteria, so some cracks will show symptoms of blight due to infection with the blight.
Prevention and control measures: 1. Water should be properly watered to keep the soil moisture stable. Do not let the soil appear dry. It is best to spray a new high-fat film to form a layer of physical polymer film to prevent infection. 2. Improve the thermal insulation performance of the arch shed, properly reduce the temperature difference between day and night (the temperature difference between day and night should be kept within the range of 12-15 °C), and ensure that there is no sudden temperature change in the shed. 3. It can spray functional foliar fertilizer and photosynthetic nutrient film fertilizer to improve the flexibility of leaves and stem cells, and avoid cleft palate due to drastic changes in water in plants. 4. Spray new high-fat film in time, which has the functions of heat preservation, moisturizing, sustained release, inhibiting virus spread, and deworming and anti-bacterial on the surface of growing plants.
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