Poplar is an important tree species in China's plain afforestation and fast-growing high-yield forest construction projects. However, pests have become a major obstacle to the development of poplars. Prof. Zheng Junbao of Hebei Agricultural University said that the main leaf pests of poplars are Yangshao, moths, yang, and white moths. Extensive use of chemical pesticides has caused pests to develop drug resistance, increasing drug use, and creating a vicious circle; excessive use of pesticides not only kills natural enemies of pests, but also seriously undermines the natural ecological balance, and directly threatens Human and livestock safety. The emergence of microbial insecticides has overcome the characteristics of chemical pesticides to a certain extent, but the effects are slow, the scope of insecticides is narrow, and they are greatly affected by environmental conditions, which limits the scope of application. Plant genetic engineering matured in the 1980s, providing a new way to control pests. The use of insect-resistant gene technology to create new insect-resistant varieties is safe and effective compared to traditional pest control methods, which can reduce investment and reduce environmental pollution and many other advantages. In order to solve the problem that insects may produce resistance to transgenic plants expressing insecticidal proteins, and in order to improve the insect resistance of transgenic plants and expand the resistance spectrum, Tian Yingchuan et al., Institute of Microbiology, Chinese Academy of Sciences, builds on a plant expression vector. Two different insecticidal mechanisms of insect-resistant genes. Professor Zheng Junbao and others spent more than eight years researching genetic transformation, laboratory tests of feeding insects, growth observations and morphological observations at the seedling stage, and molecular biological tests, and obtained excellent Poplar-based hybrids that transposed two insect-resistant genes. - Abortive female plants that do not fly. A four-year study of insect ecology has demonstrated that insect-resistant poplar 741 has control over Lepidoptera insects. In the afforestation of access roads, farmland shelterbelts and farmland forests, greening of water systems, and construction of quickleaf forests, the construction of insect-resistant 741 poplars can reduce the use of pesticides or even fight drugs, greatly reducing environmental pollution. The suitable planting area of ​​insect resistant 741 poplar is in the range of 30-40 latitudes and 105-125 east longitudes. The tree species has a strong adaptability to the soil texture and prefers deeper soils. Suitable for lands with higher groundwater levels. The insect-resistant Populus 741 should become one of the first tree species for the construction of plain greenery and fast-growing high-yield forest. The ecological safety of genetically modified trees is a matter of common concern. The insect-resistant poplar 741 does not have seeds and can not reproduce sexually, and thus has a biological barrier effect. It is planted in plain agricultural areas, far from natural forests and wild plant populations, and has a short planting time, and it cannot be a gene bank that contaminates natural forests due to genetic drift. In terms of prevention strategies, two measures can be taken in afforestation design: First, set up a physical barrier around the insect-resistant 741 poplar, that is, split the insect-resistant 741 poplar into a certain area of ​​forest on the afforestation ground, using the untransformed 741 Yang Put it in a strip. Second, 741 Yang is not planted alone, but other economic trees and flowers needed by the market and the market are also planted.
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