A: Watermelon is very susceptible to a fungal disease called Fusarium wilt during the growth process. The disease spreads through the soil. The residual time of the bacteria in the soil is as long as 3 to 5 years. In the soil where watermelons have been planted, a large number of fusarium wilt germs are often left. If the seeds are replanted next year, the watermelons will be particularly susceptible to infection and cause dead seedlings. Therefore, the land for growing watermelons should be changed every year. For those who have planted watermelons, it is better to change the rice crops such as rice and corn, or potato crops, Chinese cabbage crops, etc. However, it is not appropriate to grow melon vegetables to reduce the survival rate of Fusarium oxysporum. If it is not possible to switch crops, the seedlings of some cucurbit crops that are more resistant to Fusarium may be used as rootstocks to graft them.
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