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Agricultural measures to prevent and control the rotation of crops is forbidden to repeat and meet. Soil-borne diseases (soybean root rot) and diseases mainly caused by overwintering over winter (grey spot, brown spot, bacterial spot, etc.), and wintering pests in the soil (Soybean leafminer, two leaves A, Puma, etc.) The hazard can be mitigated through a three-year rotation. The currently popular wheat-wheat-bean, wheat-bean-zazao, wheat-zazai-bean, and wheat-wheat-bean-zazao, wheat-bean-wheat-zazao, jade-jade-bean and other crop rotation systems can reduce pests and diseases. What happened? In areas where soybean cyst nematodiasis occurs, at least five years of rotation should be implemented to reduce the disease. Removal of diseased soybeans After harvesting, field residues should be removed from the field and the soil should be turned upside down as soon as possible. The diseased body will be buried deep underground to expedite the disappearance of pathogens and reduce the disease. For overwintering pests in the soil, the pests are turned to the soil surface by ploughing, and the mortality rate of pests can be greatly increased by licking, pressing, squatting, mechanical damage, and the combination of sunlight, wind, rain, and natural enemies. Effectively slow down the occurrence and harm of pests in the second year. The varieties of pests and diseases were selected to combine the natural conditions in the region with the types of pests and diseases, and high-yield insect-resistant varieties were selected. The species should be preserved from plots without disease or from disease-free and pest-free plots. When planting crops in other places, we must first master the situation of diseases and insect pests in the producing areas, and strictly test whether there are quarantine objects. All seeds are mixed with dodder seed, wild oats, sclerotia, etc. It is forbidden to call or call for breeding, and to avoid as much as possible from cyst nematode disease. Heavy areas attract seeds. To strengthen the cultivation and management of sowing too early or too deep sowing can aggravate the occurrence of root rot. Generally, the topsoil 0 to 5 cm soil temperature is basically stable at 6 ~ 8 °C when you can sow, pay attention to moisture, humidity, should be late sowing and can not be top wet sowing. The sowing depth is generally controlled at 4 to 5 cm. If the pre-emergence herbicide is applied after sowing, the sowing depth may be appropriately adjusted. If the seeding depth is too shallow, it may easily cause phytotoxicity, but it cannot be too deep. Increase the use of organic fertilizers and rational use of chemical fertilizers. Proportions of N, P, and K should be appropriate to avoid excessive application of N fertilizers, prevent greediness, lodging, and late ripening, so as to increase soybean disease resistance, and to increase the soybean's tolerance during the entire growth period. Strong and healthy development. With at least two times of cultivating, the soybean root rot diseased plots will be carried out as early as possible according to the seedling conditions to improve the soil permeability, increase the ground temperature, and promote the formation of a large number of new roots. For continuous cropping soybeans, it must be cultivated once in mid-July to mid-August in order to block the emergence of borer borer so that adults can not excavate or reduce the amount of excavated or mechanically kill a large number of larvae, cockroaches, adults and reduce insectivorous rates. Every time before cultivating, we must fully understand the conditions, conditions, and insect pests of the field, and use it to determine the doubling operation. According to the actual conditions during the growth period of soybeans, more flexible supplementary measures can be taken. In case of rainy seasons, it is necessary to strengthen drainage and pay attention to the grass condition. Large grasses need to be manually removed later. Chemical weeding can effectively eliminate some diseases and insect sources, reduce intermediate hosts, especially reduce the humidity in the field, ventilation and light transmission, and reduce the severity of illness. Drugs to prevent and control seedling seed dressing can delay disease, pest damage, seedling protection of the main root, Paul seedlings. 50% carbendazim WP and 50% thiram can be applied to areas with severe soybean root rot disease (3:2), and the dosage is 0.5% of seed weight. For the heavy parts of soybean roots, 40% dimethoate or omethoate EC or 35% dimethocycline or 35% ethylthiophosphorus EC can be used. Seed weight 0.5% before sowing 3 to 6 days before sowing Seed dressing. For areas with heavy soybean cyst nematode disease, 35% ethylthiophos-phine or methylthiophosphorus EC may be temporarily used, and 0.5% of the seed weight is soaked 3 to 6 days before seeding, although the insecticidal rate is not obvious. However, it has a significant effect on stable production. The use of 40% dimethoate in the heavy areas of the two leaf beetles can be used to seed the seeds at 0.5% of the seed weight. Seeds must be sown within 3 to 5 days to avoid affecting the seedlings. When pests in fields such as locusts and thrips reach the prevention and control index, 40% dimethoate or 40% omethoate EC 750 to 1500 ml can be sprayed on water per hectare; and two leafhoppers, round worms, and black velvet beetles can be controlled. Such pests can be used per hectare pyrethroids 450 to 750 ml of water spray; control of ground tigers can be made into bait traps, 90% crystal trichlorfon 50 grams with 5 kg of hot water dissolved, and then mixed with the fried cake powder Mix evenly, in the evening with a mechanical or artificial sprinkle in the ditch field, hectare bean bait 22.5 ~ 37.5 kg. The main targets for prevention and control in the medium-term are sucking mouthparts insects such as aphids, thrips, and red spiders; larvae of the nymphs, nymphs, grasshoppers, and larvae and venomous moths; gray leaf spot, brown spot disease, and downy mildew. Dodder. Control of locusts, thrips, red spiders and other pests used the same drugs and seedlings. For the control of nymphs, nymphs, and bait larvae, 95% trichlorfon or 80% trichlorfon EC was sprayed on water at 750 to 1125 ml/ha. For the control of soybean gray spot, 85% triethylaluminum phosphate wettable powder can be used per hectare for 1500 to 2250 g or 25% Rhodoxenicillin WP to 1500 to 2250 g for water spray. A dodder seed was found in the field and was sprayed with 150-200 times of 48% Dimethine EC, with care removed. In the later period, the main control subjects were gray spot disease, brown spot disease, soybean borer, and so on. For the prevention of grey leaf spot and brown spot disease in soybeans, 40% of carbendazim suspension is used per hectare, 1500 g, or 50% carbendazim WP, 1800 g of commodity is used, or 50% thiophanate-methyl can be used. Wet powder, hectares with a commercial volume of 1800 grams, spraying water. Prevention and control of soybean borer, according to the forecast, accurate control, generally in the adult emergence and larval hatching before the application is appropriate, per hectare can be used 2.4% deltamethrin (enemy) EC 600 ml of water spray.