What do you know about watermelons?

The main diseases of watermelon during storage in field management, such as anthracnose, Fusarium wilt, brown rot and so on, are easily infected with such germs in the field. Therefore, it is necessary to strengthen disease prevention and control, reduce diseases in the field, remove diseased leaves in the field at any time, prevent waterlogging in rainy season, and eliminate accumulated water in the field in time. Before watermelon harvesting 1 week, 800-fold solution of 50% carbendazim, 800-fold solution of 70% thiophanate-methyl or 600-fold solution of 75% chlorothalonil wettable powder can be sprayed/kloc-0 every 7 ~ 10 days. Seriously ill plots should be rotated with non-melon crops for more than 3 years. In the sand storage method, ventilated and light-transmitting houses are selected for preservation, cleaned, and Xihe sand is used as the bottom 1750px, and seven-ripe watermelons are harvested in sunny evening or cloudy day. Watermelon is required to have a correct shape, no damage, no pests and diseases. Each watermelon should have three tendrils. Cut off both ends of the tendrils at 825px, and immediately dye the incision with dry plant ash to prevent bacteria from invading. Leave 1 green leaf on each vine node, put watermelon on the sand bed, and then spread fine river sand, which is thicker than watermelon 125px, and the sand exposes 3 watermelon leaves. The following problems should be paid attention to when using sand storage method: ① handle with care, handle with care to prevent damage to watermelon skin. ② Only one layer of watermelon is stored in the sand bed to prevent crushing. ③ Topdressing 50kg of water with 50g of potassium dihydrogen phosphate every 10d to keep the leaves green. (4) When the sand on the surface is dry and white, spray water appropriately to improve the humidity. ⑤ Sand beds are made on the same day, and collected, transported and stored on the same day.