1. The important feature of insect viruses in the prevention and control of pests is that their specificity to the host is an ideal means of prevention and control in the integrated control system. The potential for controlling insects in the whole ecosystem is controlled by pest control (not all pass killing). It is used. The participation of virus pesticides in bio-control is an ecological control method. The purpose is not to completely eliminate pests, but to control the population of host pests on which natural enemies survive to control the benign ecological cycle of farmland under the economic threshold to obtain the maximum benefit. 2. The biggest advantage of using virus insecticides to control pests is that the target field sprayed with viral insecticides not only has the pathogenic effect on contemporary target pests but also passes through the faeces, adults, eggs and dead larvae of susceptible larvae. The infection of the next generation of larvae in the host population can even proliferate and even spread to form an epidemic, leaving the target host at a low level for several years. 3. The virus insecticide has the advantages that the general biological pesticide does not pollute the environment and does not harm the natural enemies, and is not easy to produce resistance to human and livestock highly safe pests. In addition, recent studies have shown that the virus has a certain "weakening" effect on host insects, which can weaken the ability of infected host to fly, reduce the number of eggs and hatching rate, and degrade other physiological functions, so that the natural mortality rate increases, and the resistance to some pesticides is also obvious. It is advantageous to reduce this comprehensive control of pests. 4. People have fully realized that the protection of the ecological environment and the sustainable development of agriculture have become the two central problems facing humanity in the 21st century. The core connotation and basic characteristics of biological control are its integration with the ecological environment and sustainable development. Unity. Biological control is the inevitable development of science and technology in human society. Insect virus insecticides are powerful weapons for modern agricultural engineering that meet the requirements and development of the times and target organic food. The characteristic of the cup head square neck Bolt is that the head is made into a semicircular ball, and a section of square neck is made under the head. A section of square hole shall also be made on the connected part connected with this bolt. When the bolt is inserted into the connected part and the nut is screwed on, the bolt will not rotate because of the square neck. Its head is relatively smooth, and it is not easy to hook other objects. Cup Head Square Neck Bolt,Carriage Bolts,Round Head Square Neck Bolts,Cup Head Square Neck Bolts Jiangsu Jiajie Special Screw Co., Ltd , https://www.jiajiebolts.com