Pest control is the top priority of garden plant protection. With the accumulation of prevention and control experience and the deepening of relevant research, various new concepts and methods of prevention and control have emerged, especially the pest prevention and control methods developed in response to environmental protection concepts have become the focus of attention in the industry. Zhang Yongan, a professor at the Institute of Forest Ecology, Environment and Protection of the Chinese Academy of Forestry, advocates the concept of sustainable control of pests by restoring and constructing a stable ecosystem. It is a kind of defense against environmental pollution and extremely safe for people and other living things. Control method. Specifically, it is based on pests and focuses on the use of insect virus insecticides to restore and build stable ecosystems. Zhang Yongan believes that any ecosystem, whether complex or simple, has a relatively stable biome structure. Due to the influence of site conditions, climate change and the unreasonable human development or the unreasonable structure of human beings in the construction of new ecosystems, ecosystem imbalances often occur, resulting in a rapid and excessive growth of a biological population. From the ecological theory, ecosystems can generally be restored and reconstructed, and can be restored and constructed according to human design. “The conditions for a stable ecosystem are: coexistence of multiple complex environmental factors, and second, the balance of various constraints. The destroyed ecosystem and the ecosystem being built are based on their own capabilities. Gradually recover and build; First, through artificial measures, apply effective technical methods to restore or quickly build various factors in the original system into a stable new ecosystem. Application of insect virus insecticides to restore and build ecosystems will not destroy The environment, and practice has proved that the effect is very good." Zhang Yongan said. “In recent years, we have applied insect viruses in the prevention and control of pests in forestry and gardens.†Zhang Yong’an explained the prevention and control of pine caterpillars in forestry. Pine caterpillars are the largest leaf-eating pests in China’s forests, using pine caterpillars. Polyhedrosis virus (DCPV) has prevented more than 200,000 hectares of pine caterpillars. Many forest areas that have used DCPV virus or DCPV virus and Bacillus thuringiensis (Bt) compound microbial pesticides have prolonged the outbreak period of the pine caterpillar disaster and reduced the disaster area. Through the application of DCPV virus, a relatively stable forest ecological structure with pine caterpillar as the core and various plant communities, DCPV virus, natural enemies of birds and natural enemies of insects as inhibitors has been gradually restored and constructed. In the field of gardens, the application of virus control spring scorpion has also achieved good results. Zhang Yongan said that spring scorpion is an important leaf-eating pest in northern China and Central Plains, mainly affecting plants such as poplar, willow, alfalfa and alfalfa. More than 10,000 acres. AciNPV is a baculovirus that has strong pathogenicity to spring scorpion and can control the population density of insects for a long time. The application results over the years show that the use of the virus 8.2 × 105 PIB / ml spray to control 3rd instar larvae, 10 days mortality can reach 84.4%. The 3rd instar larvae were sprayed with 1.6×106 PIB/ml, and the 9-day mortality rate reached 92.3%. The continuous control effect is generally 3 to 5 years. In addition, the prevention and control of the American white moth is a very difficult problem in many parts of the North. In fact, viruses can also be used to kill insects. The American white moth was introduced to China in 1979, and its omnivorous and high fecundity and human transmission made it more difficult to control. HcNPV virus is a very effective insecticide against the American white moth. The concentration of 6.27×1011 PIB/ml to 1.85×1012 PIB/ml of HcNPV sprays the contemporary larvae, the control effect can reach 92%; and after HcNPV+Bt compounding Prevention of 3 to 5 instar larvae can reduce the density of the larvae by about 90% in 3 to 4 days. The remaining population can carry the virus into the population and continue to function. Zhang Yongan said that for a foreign pest such as the American white moth, when it invades a new ecological environment, because the pest is miscellaneous, the ecological environment is not strict, and an effective control system is not formed in the new habitat. It is easy to settle down and break out. In the prevention and control, in addition to the application of chemical pesticides to completely eliminate areas that can be completely eradicated, the areas that have already settled must adopt corresponding control methods in the long run. Bi Convex Spherical Lens,Convex Mirror Optics,Bi Convex Lens,Convex Contact Lens Lambda Research Optics ChangChun,LTD. , https://www.lambdachina.com