First, prevention is the main The occurrence of plant diseases is from point to surface, from less to more, from light to heavy, and it is a critical period for this type of disease to focus on prevention and to seize the prevention and treatment of diseases. The use of drugs before or during the onset of the disease is very effective if only one drug is used. If the drug is used after a large area of ​​disease has occurred, it must be used at least three times to prevent the spread. This will increase the cost of the drug and increase the labor cost. Irreparable damage to crops. Second, to achieve symptomatic medication Many growers do not recognize the condition and cannot choose the right medicine, resulting in poor efficacy or even ineffectiveness. One is to misunderstand plant physiological diseases as invasive diseases and use fungicides to treat physiological diseases. Physiological diseases are diseases caused by lack of certain elements, and only by supplementing the corresponding elements can they be cured. If we use fungicides to prevent and cure, the medicine is not symptomatic, it is ineffective, artificial and costly. The second is to use fungicidal drugs to prevent bacterial diseases and viral diseases, and cannot achieve therapeutic effects. Instead, they believe that the quality of purchased drugs is problematic. Third, there are many types of fungal diseases occurring in crops. If the disease is judged incorrectly, the use of fungicides is not appropriate, and the expected control effect will not be achieved. Both gray mold and rust are fungal diseases, but their use is very different. Fourth, there is a difference between the protective bactericide and the therapeutic bactericide. The protective bactericide is used before the occurrence of the disease. The protective film is established on the stem, leaf and fruit surfaces of the plant to prevent the invasion of the bacterium and provide protection. The use of drugs before the onset of the disease is effective, but the control effect after the onset is poor. Therapeutic bactericides generally have a systemic action, which can be rapidly absorbed and transmitted to the plant body to kill the bacteria for therapeutic purposes. After the onset, therapeutic agents should be selected. Third, the application of pesticides should be correct Root diseases should be treated with liquid medicine. Diseases on stems should be sprayed or brushed. Leaf diseases should be sprayed on the front and the back, and should be evenly and thoughtfully focused. Such as root rot must use watering methods, tobacco black stem disease spray method. NINGBO MEDICAL EQUIPMENT CO.,LTD , https://www.techartmeds.com