In the summer, especially in the period from June to July , the temperature will rise further, and the pests of vegetables will be more serious, which will create conditions for the transmission of poisonous pests and viral diseases. At the same time, with the arrival of the hot and rainy season, the rainfall will increase, which is the season in which the open vegetables grow faster, and it is also the season when the autumn vegetable seedlings are about to begin. Therefore, the prevention of summer vegetable virus disease is of great significance to ensure vegetable production and harvest.
Viral diseases can occur in a variety of vegetables, especially in open field vegetables, and the degree is also heavy. There are many manifestations on the symptoms. Common symptoms include leaf mosaic, streaking, shrinkage, fruit malformation, dwarfing of plants, clumping, etc., which are generally easier to identify in the field. However, if the symptoms of the symptoms are manifested, the prevention and treatment is generally poor. To this end, we must do a comprehensive prevention and control of vegetable virus diseases.
First, seed treatment. Seed-borne bacteria are an important source of crop virus diseases, such as seed-borne bacteria, which can be affected by crops at the seedling stage and have a great impact on yield. Therefore, pay attention to seed treatment before planting. Soak seeds for 10 to 20 minutes with 10% trisodium phosphate solution or 1% potassium permanganate solution before sowing to passivate the pathogen activity on the seeds.
Second, seedling management. Strengthening the management of vegetable seedlings is the key to preventing viral diseases. First, we must pay attention to the use of pest control measures, such as regular use of pesticides and silver ash film to avoid cockroaches, etc., to reduce the chance of pest transmission. The second is to take appropriate shading measures, such as using shade nets to shade, to avoid high temperature in the seedbed.
Third, chemical control In the beginning of the occurrence of vegetable virus disease, spraying drugs to prevent and cure viruses, you can choose 83 anti-agents, virus A , virus Becker and other water spray control. In the adult stage, vegetables should be strengthened to manage fertilizer and water, and cultivate strong plants to improve the resistance of plants to disease resistance and disease resistance.
(Source: Farmers Daily)
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Vitrified Grinding Wheels mean grinding wheels in ceramic bonded. Vitrified grinding wheels can be superabrasive grinding wheels like diamond grinding wheel or CBN Grinding Wheels. It also can be abrasive grinding wheels such as white aluminum oxide grinding wheel,pink grinding wheel,silicon carbide grinding.
Vitrified grinding wheel is only one type of bond, which is ceramic, it can be in any type of abrasive.
The main ingredient of vitrified bond are vitreous material with low melting point, such as borosilicate glass, lead glass, etc.It is widely used in various grinding methods such as outer circle, inner circle, flat surface, centerless, etc. It is the most commonly used bonding agent for abrasive tools.
Vitrified bond is characterized by high chemical stability, almost can work in a variety of cooling media, small elastic deformation, brittle, can be made into a variety of hardness levels of grinding tools to adapt to the processing of various hardness of the workpiece. Vitrified bond has good self-sharpening.
The grinding efficiency of single crystal diamond with vitrified bond grinding wheel is higher than metal bond grinding wheel. The wear ratio is very small and the processing cost is low. Therefore, the grinding efficiency of single crystal diamond with ceramic bond grinding wheel can be greatly improved.
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