From the analysis provided by you, the watermelon you planted is likely to have an epidemic, which is mainly caused by fungal infestation. In particular, young stalks and tender tips are the most affected, and the damaged parts have dark green water immersed in spots and rot, and the branches and branches above the joints are obviously contracted. Temperature 28 ~ 30 °C, continuous rain, excessive watering, earthy sticky weight, even simmer, the application of organic fertilizer is not conducive to the occurrence of epidemic disease. Control methods: 1 Seed disinfection, seed dressing with 0.3% of 25% Rhizoctonia wettable powder. 2 Adopt crop rotation and strengthen the drainage in the field, drain water in time after rain, and cultivate sorghum. 3 At the beginning of the disease, 40% ethidium-phosphine aluminum WP can be used 300 times or 64% antiviral 600 times liquid to be used alternately. Spray once every 7 days and spray 3 times. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone Xi'an Double H Health Technology Co., Ltd , https://www.xadoubleh.com