The role of viral insecticides in the control of Helicoverpa armigera

The main results are as follows: 1. the important feature of insect viruses in pest control is that their specificity to hosts is an ideal means of control in the integrated control system. the potential of beneficial insects in the whole ecosystem is utilized. The participation of viral pesticides in biological control is a means of ecological control, the purpose of which is not to completely eliminate pests but to control the population of host pests that natural enemies depend on to restore the virtuous ecological cycle of farmland under the allowable level of economic threshold and finally obtain the maximum benefit. 2. The greatest advantage of using virus insecticides to control pests is that the target fields sprayed with virus insecticides not only have infection and pathogenic effect on contemporary target pests, but also can infect the next generation of larval viruses through feces, adults, eggs and dead larval corpses of susceptible larvae, which can proliferate and even spread to form epidemics in the host population, making the target host at a low level for several years. 3. Viral insecticides have the advantages of general biological pesticides, which do not pollute the environment, do not harm natural enemies, and are not easy to produce resistance to highly safe pests of human beings and animals. In addition, recent studies have shown that the virus has a certain "weakening" effect on host insects, which can weaken the flying ability of infected hosts, decrease their fecundity and hatchability, and increase their natural mortality due to the degradation of other physiological functions. the resistance to some pesticides is also significantly reduced, which is beneficial to the integrated control of insect pests. 4. People have fully realized that the protection of ecological environment and the sustainable development of agriculture have become the two central issues facing mankind in the 21st century. The core connotation and basic feature of biological control is its integration with ecological environment and its unity with sustainable development. Biological control is the necessity of the progress of science and technology in human society. Insect virus insecticide is a powerful weapon of modern agricultural engineering aiming at organic food to meet the requirements and development of the times.