The diseases of tomato in greenhouse mainly include: leaf mold, powdery mildew, gray mold, late blight, early blight, coal contamination, sclerotinia, bacterial wilt, soft rot, bacterial myelopathy, stem rot Disease, mosaic disease, streak disease, leaf rolling disease, sunburn disease, umbilical rot disease. Insect pests mainly include spotted fly, whitefly, and aphids. According to the causes of plant diseases can be divided into non-infectious diseases and invasive diseases. The prevention and treatment of non-invasive diseases is also known as the control of physiological diseases. There are three types of invasive disease prevention: soil-borne disease prevention and control; prevention and treatment of leaf, stem, and fruit diseases; prevention and control of insect pests. 1. Prevention and treatment of non-invasive diseases (control of physiological diseases) Such as the umbilical rot and sunburn should be strengthened in management to enhance the ability of the soil to retain water. Avoid high-concentration or excessive nitrogen fertilizers during high-temperature drying. 2. Infestation Disease Prevention and Control 2.1 Prevention and control of soil-borne diseases. Such as wilt disease, nematode disease, etc., can take the following methods: 2.1.1 soil disinfection Soil disinfection can be used potassium permanganate, formaldehyde, if the summer heat season can be covered with plastic film high temperature closed disinfection. 2.1.2 The cultivation and management are closely planted to improve the ventilation and light conditions of crops, reduce the humidity on the ground, avoid partial application of nitrogen fertilizer, and appropriately increase phosphorus and potassium fertilizers to improve the disease resistance of crops. During the middle and late stages of crop growth, the pesticide was applied and sprayed with foliar fertilizer for 2 to 3 times. 2.1.3 Chemical control During the middle period of crop growth, if a disease occurs, the corresponding agent may be used for spraying or irrigating. In addition to the method of irrigating, the nozzle of the atomizer may be removed, and the sprayer may be used to irrigate the root directly. . If nematodes are found, they can be treated directly with Nemophilus, abamectin, dichloroisopropyl ether nematicide. 2.1.4 Rational rotation of disease-resistant greenhouses to change the resistance to sweet peppers, peppers and other vegetables, can reduce the harm. Can also change vegetables, such as lettuce, Chinese cabbage and other fast-growing green leafy vegetables, although susceptible to such vegetables, but the impact on yield is not, can reduce the damage caused by nematode disease. 2.2 Prevention of Diseases of Middle, Stems, and Fruits such as Leaf Blight, Powdery Mildew, Gray Mold, Coal Smear, Early Blight, Late Blight, Sclerotinia, Stem Rot, Soft Rot, Bacterial Myelopathy , Bacterial wilt, Mosaic disease, Stripe disease, Roll leaf disease, can take the following methods: 2.2.1 Fungal diseases or worm disease can be used in sunny days Carbendazim, chlorothalonil, thiophanate-methyl, Mancozem and other agents spray control, in case of rainy weather, chlorothalonil and quick-silver smoke can be used to control fumigation. 2.2.2 Bacterial Diseases Strengthen field management, remove water in a timely manner, avoid stagnant water, and spray pesticides such as agricultural streptomycin, cupric chloride, and copper citrate. 2.2.3 Virus diseases strengthen seedling management, nurturing strong seedlings, preventing and controlling good locusts and other virus transmission media, and can also hang silver ash strips to avoid plague, and find diseased plants that need timely spraying of disease and disease, drug nemesis, and spraying. Antiviral Inducers 83 Anti-proliferative agents to control the spread of disease and have a comprehensive effect on plant viruses and virus mediators. 2.3 Insect pest control such as whitefly can use the yellow board to attract insects, aphids can be used to avoid the silver gray film strips, spotted lilies can be sprayed to control the king of the king.