During the process of grafting and growing watermelon in the greenhouse, the phenomenon of seedling wilting sometimes occurs. The measures to prevent wilting are introduced as follows:
Scientific selection of rootstocks in commonly used watermelon rootstocks, rootstocks resistant to blight and not susceptible to acute wilting symptoms are better with pumpkin rootstocks, followed by gourd rootstocks and watermelon manures. When grafting, we must choose excellent disease-resistant rootstock varieties, such as Qingyan No.1, Almighty Iron F1, and disease-resistant super-rich.
The use of medicaments to control and control Fusarium wilt is also a effective method for preventing wilting. Soak the seeds with 70% thiophanate-methyl 400 times for 30 minutes, then rinse off with water. It can also be rooted in the root of the diseased plant at the beginning of the disease with 40% cucurbitin 1000 times solution, 250 grams per plant, once every 7 to 10 days, a total of 3 times.
With the plugging method, the depth of planting should be suitable in the process of watermelon grafting. It is best to use the plugging method, which is more resistant to wilting than the docking method. Grafting wounds should be 1 to 2 cm from the ground when planting, so as to avoid the occurrence of adventitious roots in the scion, and the loss of grafting significance.
Strengthen field management should pay attention to drainage and water supply evenly, avoid excessive fruit setting, ensure the number of leaves of fruit set when pruning, maintain moderate leafy leaves, reduce evaporation of water, and maintain strong root activity. The soil temperature is higher in the late growth stage, and the grass can be covered on the ground, and the use of nitrogen fertilizer is controlled. During the fruit enlargement period, spraying 1% magnesium sulfate solution on the foliage prevents the occurrence of acute ascension.
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