1. Prevent the development of resistance to germs. Can't use one kind of fungicide continuously, or use the same kind of fungicide several times in one growth period, limit the number of times for systemic use
2. Take appropriate countermeasures according to the law of disease transmission. Crop diseases include airborne pathogens, seeded seedlings, carriers of soil, soil or soil-borne fertilizers, and harmful insects, and mites. Diseases caused by viruses such as aphids and planthoppers should be treated before the poisonous pests harm the crops. If the poisonous insects have absorbed the host juice, then the insects can no longer prevent the disease. Diseases in the plant transmission room, such as smut in many grasses, need to work hard on seed treatment. Seedlings should carry seedlings first and then leave the field. For soil-borne diseases (including various nematodes), most of them use chemicals to treat soils and seedbeds, such as using multiple nematicides or long-term nematocides and fumigants. For airborne diseases, most of them use conventional foliar spray and dusting (including dust agent). Induced diseases and powdery mildew harm wheat, and seeds can also be treated with systemic agents.