Research and practice have proven that crops can be controlled or mitigated by cropping or interplanting, interplanting, or mixed cropping, and that the occurrence of certain pests and diseases can often be controlled or mitigated, thus receiving the effect of “do not apply pesticides and win pesticidesâ€. 1. Cotton-cotton intercropping this method of arranging is very beneficial to controlling cotton aphids at the seedling stage. Because of the barrier function of wheat, cotton intercropping of wheat not only directly affects the migration of cotton aphid, but also the temperature of cotton field is about 1°C lower than that of monocropping field. With the role of wheat natural enemies, seedling mites can be controlled without pesticide control. According to observations from 4 test sites in Shandong Province in 1988, the annual total of insecticide-free cotton fields was reduced by 31.3%, while that of wheat-lined cotton fields was reduced by 18.1% and 42.2%. 2. Wheat smoke nesting can effectively control the damage of tobacco stems because the wheat strains can impede the migration and landing of soot, and the role of natural enemies such as coccinella septempunctata. According to the Institute of Special Purposes of Shaanxi Academy of Agriculture and Forestry Sciences, tobacco mosaic disease occurred in Shanzuo Tian. The rate of diseased plants was as high as 62.7%, and only 5% of the fields were planted. 3. Intercropping cotton mungbeans in May and June, a single crop of small cotton trees, is not conducive to concealment and habitat of natural enemies. Intercropping field mung bean is fast and the field microclimate is conducive to the survival and reproduction of natural enemies. Soybean meal is a good food for natural enemies, so the number of natural enemies increases. , cotton pests reduce, generally less control 1-2 times. 4. Cotton Field Seed Rape Every row of 8-10 rows of cotton fields in the cotton field is sown with 1 row of rapeseed, using rapeseed for rapid growth, lush foliage, early occurrence of rapeseed, etc., to attract natural enemies to settle and breed; after the occurrence of cottonseed, natural enemies on rape Automatic transfer to nearby cotton seedlings can effectively control or reduce the occurrence and harm of cotton aphid and cotton bollworm. According to a survey from 1979 to 1982 in the Liaocheng area of ​​Shandong Province, the number of natural enemies per plant was between 46 and 316, and the amount of alfalfa was 10-20. The stock of single-line natural enemies per hundred meters of rapeseed was 1572-3987, which was effectively controlled for 4 consecutive years. The seedlings were damaged and in 1981 they also controlled the second generation of cotton bollworms. 5. In the cotton field, corn is planted in every 10 meters of cotton fields in 1 row of corn (50-60 acre per acre, 2-3 per abutment, which can effectively improve the ecological structure of the cotton field, trap cotton bollworm and corn pupa to reduce eggs. The amount of eggs laid on seedlings was investigated in seven counties in Shandong Province from 1980 to 1983. The amount of eggs laid on cotton seedlings was reduced by an average of 60-70% in intercropping cotton fields. 6. Cotton field sorghum planting a small amount of sorghum next to the cotton sorghum trench can trap natural enemies such as spiders, dragonflies, beetles, ladybugs and florets to suppress the occurrence and damage of cotton aphid and cotton bollworm. 7. In the cotton field, Hulubahuluba, also known as vanilla, has a special fragrance and is a spice plant with high economic value. Interplanting with cotton not only has a direct repellent effect on the early-staged cotton aphid, but also It can also improve the ecological environment of cotton fields and help natural enemies survive and reproduce. According to inspections, between 100 and 1000 winged cotton aphids in farmland are generally 0.2-0.3 million heads, while the monocropping field is as much as 2-50,000 heads. 8. The allicin volatile from garlic or garlic of cotton or rape has a pungent odor, which can make the aphid that injure cotton or rape “back homeâ€; at the same time, the occurrence of second generation cotton bollworm on cotton is also significantly reduced. According to the investigation on cotton, the cotton seedlings were not rolled before the June 10 seedlings and the seedling shoots had no control. The same conditions of monoculture Tianmiaojing were controlled twice, and the highest leaf-rolling rate was still 25-28%. The second-generation H. armigera had only 12 eggs, and the single-crop field had more than 500 eggs. 9. Soybean or peanut intercropped ramie in the soybean or peanut ground, evenly planted on the ground 200-300 strains of ramie, can make the turtle shell to the egg field, peanut field spawning ricinus leaves poisoning after death, the effect is not Subsequent to the application of chemical pesticides. According to experiments, 350-400 ramie are planted uniformly in the peanut field per acre. Each ramie can kill 4-5 tortoiseshells on average, reducing the population by 90%, and the rate of peanut worms falling below 5%. Increase production by more than 10%. 10. The interspecies of pumpkin nectar between pumpkins can induce the parasitic natural enemies of corn borer, the black egg bees, which can effectively reduce the damage of corn borers through the parasitic effect of black eggs. 11. Corn intercropping can also significantly reduce the damage of corn borer. 12. Intercropping Maize and Spicy Pepper As a result of the shading effect of corn, the incidence of sunburn and virus disease in pepper was 72% lower than in monocropping field. The interplanting of corn and green pepper reduced the incidence of green pepper virus disease by 56.9%. 13. Inoculation of corn in rows reduced cucumber mosaic disease by 61.6%. 14. Intercropped corn as a result of the field temperature than the single field decreased by 0.5 °C, the ground temperature decreased by 2 °C, cabbage virus disease can be reduced by more than 20%, white spot disease decreased by 18%, cabbage soft rot, downy mildew also significantly reduced. 15. Corn and peas are also good friends. Both will benefit from each other and both will increase production. 16. The mixed use of flax and spring wheat can significantly reduce the occurrence of cotton bollworm due to the protective effect of wheatgrass. According to a survey conducted by the Changji County Agricultural Research Institute in Xinjiang, there is a small amount of bollworms in the mixed field only on the edge of the ground, while the average number of cotton bollworms per square meter is 4-10, and the rate of flower bud damage is as high as 35%. 17. Intercropping potato and garlic can inhibit the occurrence of potato late blight. 18. The scent of the onions and carrots together excites each other's pests. 19. Garlic cabbage between rows can reduce cabbage soft rot disease by 62.5%. 20. The irritating odor of lettuce, tomato or peppermint, which is found in cruciferous vegetables, such as cabbage and cabbage, can make the white butterfly on the cruciferous vegetables spam.
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