Wheat disease effects and control measures
Wheat is one of the major food crops in China, especially in the north. It has a large area for cultivation and accounts for about one-fifth of the area of ​​arable land. Shandong is the main wheat producing area, and its annual planting area accounts for 60% of the cultivated area. Due to its large planting area, it is cultivated year after year. There are many types of diseases, and some diseases seriously affect the stable production and high yield of wheat. According to statistics, there are more than 40 major diseases occurring in wheat across the country, and there are 33 species of wheat diseases in Shandong. The main disease types and harms are basically similar to the national situation. Diseases of wheat: The major domestic diseases occur in North China's winter wheat regions such as North China, Northwest China and Huaibei, and Sichuan, Yunnan and other places in the southwest. Shandong takes place in southwest Shandong, Lunan, Luzhongnan and other inland wheat regions. Leaf rust: In the past, it only occurred in parts of the southwest and the Yangtze River basin. In recent years, it has occurred severely in North China, Northeast China, and northwest China. Shandong is a common occurrence, and it has been increasing year after year. Some years are worse than stripe rust. Stem rust: It mainly occurs in the southeastern coastal areas of China, the winter wheat region in the middle and lower reaches of the Yangtze River and in the southern provinces, and the spring wheat region in the northeast, northwest, and Inner Mongolia. In Shandong, the occurrence of late mature wheat in the coastal areas of Jiaodong and inland lakes was relatively heavy. The diseases of wheat are characterized by rapid development, long-term spread, widespread epidemics in a short period of time, and severe reductions in production. Due to the previous focus on how to prevent stripe rust, leaf rust was ignored. In recent years, leaf rust has developed rapidly, and in some years it has been more harmful than stripe rust. Rust hazard Wheat is not confined to the site of disease. If chlorophyll is destroyed, the photosynthesis area is reduced only partially, and the deprivation of nutrients and the loss of excess water are all plant-like. According to the experiment, inoculation of rust on the flag leaves caused a loss of 80%. If the flag leaves were removed, the nutrient loss was only 34%. Therefore, the loss caused by rust is mainly caused by the spores of rust causing the host's epidermis to rupture, resulting in increased transpiration, poor grouting, thin grains, and a decrease in grain weight. It has been identified that the epidemic of wheat stripe rust in China is basically divided into three pandemic areas: (1) Northwest, North China, (2) Southwest endemic areas, (3) Xinjiang Yili district endemic areas. Wheat stripe rust in Shandong Province is affected by the northwest and north China epidemic areas. In view of the occurrence of wheat virus, the loss is serious. At present, there is no effective agent for the recovery of diseased strains by treating the virus. In the prevention and control, comprehensive prevention and control strategies shall be adopted, which mainly include agricultural control and chemical pesticides. Wheat disease prevention measures include: 1. Reasonably arrange the wheat cultivation system, and try to avoid intercropping between cotton, wheat, tobacco, wheat, etc. All the big autumn crops will be cultivated and destroyed in time to solve the problem of weed pests. 2. After the seedlings of wheat seedlings, emphasis should be placed on using insecticides to treat pests, and after spraying, pests should be sprayed before emergence. 3. Avoid sowing at the time when pests and diseases often occur, and adjust the sowing date of wheat. 4. Now that the scientific progress, we can also use spore traps to prevent wheat pests and diseases. Its working principle is to detect pathogenic bacteria spores and dust particles in the air in the test area with the air flow and infection, and it is a specialized equipment for crop disease monitoring that should be provided by the agricultural plant protection department. 5. To strengthen the supervision of the growing environment of wheat, everything must be prevented before it occurs.
The main function of the edge banding is to seal the cross-section of the board, so as to avoid the damage of the board and the adverse factors (mainly moisture) in the process of use and prevent the formaldehyde inside the board from volatilizing, and at the same time achieve the effect of beautiful decoration.
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PVC furniture edge banding is relatively light, which is relative to metal and plexiglass. The reason for the lightness is not because it is a polymer compound, but because they are organic compounds, which are composed of carbon, hydrogen, oxygen, and chlorine. And other lighter elements. PVC Edge Banding,Edge Banding Pvc,Pvc U Trim Edge Banding,Pvc Edge Banding Trimmer Henan Shunbang Chemical Industry CO.,Ltd , https://www.sbcpe.com
The material of pvc furniture edge banding is plastic, which is easy to process. Plastic has plasticity, that is, it deforms after heating or pressurizing, and maintains its original shape after the temperature drops or the pressure disappears. It can be processed into edge bands of their respective shapes by extrusion and other methods, such as T-shaped edge bands, H-shaped edge bands, D-shaped edge bands, V-shaped edge bands, I-shapes, and so on.
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