Question: The grower with the tail number of 0482 in Luancheng County, Hengshui City asked: The watermelons planted in their greenhouses have recently discovered that some watermelon seedlings are curled up. How is this going to happen?

Zhou Shigang: There is a phenomenon of leaf rolling. First of all, determine if there is a lack of water in the soil. In fine weather, the temperature in the shed increases, and the roots of the seedlings are not yet well developed. Water shortage can easily cause leaf curling. In addition, high temperatures and lack of timely release of air can also cause further increase in humidity within the shelter. Also check if there is a watermelon virus disease. Virus disease can also cause the roll of watermelon seedlings, but virus disease should be distinguished from the first two physiological phenomena. Virus disease not only can cause dwarfing of plants, leaflets become smaller, and stems distort and atrophy. Only by identifying the cause of the disease can we prescribe the right medicine, water and fertilize, and timely adjust the temperature in the shed according to temperature changes to prevent viral diseases.

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