1, mixed species of various crops have the characteristics of the secretion of special substances, these special substances for certain pests have a certain degree of prevention and repellent effect. Therefore, to grasp the characteristics of various types of crop secretions, carry out reasonable collocations, use nests, and use their complementary functions to achieve the purpose of disease prevention and deworming. For example, mixed tomato cultivars of leeks can play a role of “disease-free prevention, disease prevention and treatment†for tomato root rot wilt disease; mixed cabbage and amaranth, can prevent cabbage root rot; garlic and rape intercropping , Can control locusts; garlic and potato intercropping can inhibit potato late blight; peas interplanting onions, can prevent pea smut; spinach and lettuce intercropping can reduce pests and diseases; onion and carrots adjacent cultivation, their respective distribution Odor can gradually pest each other, to achieve mutual benefit and symbiosis; mixed cabbage and lettuce, can avoid the cabbage butterfly on the flowering heart; cabbage and tomato or lettuce mixed species, can make a variety of cabbage pests to avoid it. In fact, the intercropping, mixing or rotation of onions and garlic with vegetables and other crops can effectively prevent the growth of pathogenic bacteria and reduce the density of pathogenic bacteria in the soil, achieve soil disinfection, and prevent the diseases of various vegetables. 2. The principle of planting insects with the same acupuncture points is the same as interplanting, but the cultivation methods are different. For example, eggplant and wormwood are planted in the same hole to inhibit eggplant blight. The method is: After the eggplant is planted, 4-8 pieces of Artemisia species are sown next to the eggplant seedlings. When the Artemisia selengensis grows to 20-25 cm, it will be harvested. The preserved eggplant seedlings will continue to grow; the watermelon and the Artemisia ordosica will be inhibited by the watermelon seedlings. (Fusarium wilt), the method is: when the kind of watermelon, 4-8 pieces of Artemisia species and watermelon species are planted in the same cavity. When Artemisia selengensis grows to 20-25 cm, it is harvested and the watermelon seedlings are left to grow. According to the height of Artemisia halodendron, timely harvesting should be done so as to avoid glory with eggplant and watermelon, compete for water, compete for fertilizer, and affect the growth and development of cultivated crops. 3. Effective and effective crop rotation can not only regulate soil fertility, but also effectively reduce the occurrence of crop diseases and insect pests, especially for non-feeding pests and mono-edible pests with a narrow range of feeding, and pathogens with smaller parasitic range. The effects of diseases caused by living things are more pronounced, and there is no uniform model for rotation, which should be determined according to the specific conditions of each place. Effective crop rotation can be carried out between food crops, between vegetables, between vegetables and food crops. 4. The old land is renewed, and some of the vegetables are fixed, the varieties are small in selection and the investment is large and the benefit is high. For example, in the greenhouse, with the increase of cultivation time, the degree of soil salinization and soil-borne diseases become more serious, which affects The quality and yield of greenhouse vegetables. In this regard, we can take a solution to the problem of land and land. The method is to eradicate topsoil from the plough layer and replace it with nontoxic and fertile fields. 5. Grafting and preventing disease At present, grafting disease prevention technology is mainly used for the production of melon vegetables. Soil-borne diseases are a major problem in the growth of melons, especially after melons have been planted with blight, and the incidence is generally between 20% and 30%. Severe block up to 70% ---80%, or even out of production. Among them, watermelons and cucumbers are the most affected and grafting technology can effectively prevent and control the occurrence of wilt disease.
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