How to scientifically root and prevent disease?

Root disease always causes an important cause of dead crops, and there are many types of root diseases such as Phytophthora root rot, Pythium root rot, Fusarium root rot, Bacterial wilt, Fusarium wilt, and yellow wilt. Diseases, etc., some of these diseases mainly damage the main roots, some harm the capillary roots, and some harm the base of the stems. In addition, most of the existing pesticides cannot be transmitted from the top to the bottom. Therefore, how to accurately transport the pesticide to the diseased site has a great impact on the prevention and treatment of root diseases.