The melon yellow leaves directly led to the weakening of the light and the ability of the leaves, and the lack of synthesis of organic nutrients, which severely reduced the overall yield of melon. This melon yellow leaf is mainly caused by poor root growth, resulting in difficult absorption of nutrients, rather than bacterial, fungal infection. The root of prevention and control lies in early prevention, careful management from the seedling stage, and the cultivation of strong seedlings and strong trees. The measures are as follows:

First, grow strong trees in the early stage. First, pay attention to improving the soil and creating a suitable soil environment for plant growth. Prior to planting, adequate base fertilizer should be applied, and in particular, attention should be paid to the use of biological bacterial fertilizer and decomposed organic fertilizer. The soil must be deeply turned (30-50cm in depth is appropriate). This can not only supplement the nutrients needed for plant growth, but also improve the soil. Structure, reduce secondary salinization of soil and reduce soil pathogens. Secondly, biological bacterial fertilizer was applied at the time of colonization. The growth environment of seedling roots requires an adaptation process from the substrate to the soil. How to adapt the root system to the new environment as soon as possible is particularly important. Bio-fertilizer can effectively activate loose soil and improve the utilization rate of organic fertilizer. More importantly, beneficial bacteria in biological bacterial fertilizer can inhibit the infection of harmful bacteria in soil and reduce the occurrence of disease. Therefore, the application of biofungus at the time of planting not only improves the rhizosphere soil environment, but also builds a “bridge” for the smooth transition of the root growth environment from the substrate to the soil, which is conducive to slow seedling growth. Only when the root system grows, will capillary roots absorb a large amount of nutrients in the soil in order to achieve the purpose of strong trees, thereby enhancing the plant's own resistance and reducing the occurrence of yellow leaves.

Second, attach importance to blade conservation. The leaves are the factories where the plants perform light and their effects. Therefore, the healthy growth of the leaves of the plants is the basis for normal photosynthesis and the basis for the high yield of vegetables. How to extend the leaf functional period and prevent premature leaf failure? This requires attention to the conservation of the blades. First of all, pay attention to reasonable fertilization, timely replenish the nutrients consumed in the soil to ensure the normal growth of the leaves, will not occur due to the lack of various types of physiological yellow leaves. Second, early prevention of leaf diseases, melon seedlings prone to bacterial leaf blight, bacterial blight, etc., it is recommended that vegetable farmers to spray DT500 times early to add chlorothalonil 600 times to prevent, spray 7 days. Again, avoid leaving little leaves and large leaves, but leave more leaves and leaves should not be large. Expert technicians pointed out that the leaf area of ​​a netted melon should not be less than 7000 square centimeters, so as to ensure the high quality and high yield of melon, it is recommended that the vegetable farmers in the melon production process, the main vine grows to 15 leaves when they start to stay in melon, long. Beheaded when it reaches 25 leaves. Finally, timely spraying chitin, alginic acid and other nutrient foliar fertilizers, supplement the lack of root fertilization, provide all the necessary elements of plant growth, improve the disease resistance of the leaves.

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