　 It is of great significance to prevent pests and diseases in wheat planting period and to prevent the occurrence of pests and diseases in the seedling stage and ensure the effective control of wheat pests and diseases throughout the year. Recently, the National Agricultural Technology Extension Service Center issued guidelines for the prevention and control of wheat pests and diseases, suggesting that different ecological zones use agricultural, biological, physical, chemical and other comprehensive measures to plant disease-resistant varieties, vigorously promote chemical dressing and rationally adopt appropriate The late sowing, clearing the field self-produced wheat seedlings and weeds along the roadside, effectively control the pests and diseases of wheat.
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According to the winter wheat planting situation and the occurrence of pests and diseases in the past year, the wheat pest control in autumn and winter is mainly in the Huanghuaihai wheat area, the middle and lower reaches of the Yangtze River, the southwest wheat area and the northwest wheat area. Huanghuaihai wheat area, mainly with sheath blight, root rot, total etch, smut, cyst nematode, yellow mosaic disease, underground pests and weeds, and cure rust, powdery mildew, mites and ash Flying insects and other pests. The wheat area in the middle and lower reaches of the Yangtze River is mainly affected by sheath blight, total erosion, smut and smut, and a few fields have underground pests. The southwestern wheat area is dominated by wheat stripe rust, taking into account pests such as scab, powdery mildew, wheat stubble, wheat spiders and underground pests. In the northwest wheat area, wheat stripe rust, powdery mildew, smut and underground pests are the main control objects.
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The key control technologies are:
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　　 1. Planting resistant ( resistant ) pests and diseases.
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　　 2. Chemical dressing. According to the condition of pests and diseases, high-efficiency suspension seed coating agents such as tebuconazole, difenoconazole, fludioxonil, diphenyl ether, and flavonol are used to prevent disease by wheat seed coating, and coating with appropriate amount of imidacloprid suspension coating agent Pests, yellow dwarf disease and bushy dwarf disease, the combination of the two can cure the main pests and diseases in the seedling stage. In the strip rust disease summer area and its surrounding wheat area, seed dressings such as triadimefon and tebuconazole are used for seed dressing, and the stripe rust and powdery mildew in the seedling stage are treated concurrently to prevent the occurrence of smut in the later stage. In the total eclipse-producing area, the seedlings or coatings of the difenotropine suspension seed coating agent and the thiamethoxam suspension agent are mainly used ; the phosophos or chlorpyrifos seed dressing can be selected for the underground pests ; the soil-borne diseases and the underground pests For particularly severe fields, it is necessary to carry out the treatment of the soil. Seedling stage aphids, wheat spiders and underground pests occur in areas with severe damage, and seed dressing is carried out with phoxim or imidacloprid suspension seed coating.
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　　 3. Agricultural measures. In areas or areas where cystic nematodes are severely affected, it is important to promote the suppression of disease control measures after sowing and autumn seedlings. In the summer area of ​​wheat stripe rust, the method of artificially eradicating and spraying herbicides should be used to remove the self-produced wheat seedlings. According to the lyrics during the sowing period, the suitable sowing time should be adopted to reduce the infestation of stripe rust in the seedling stage.
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　　 4. Autumn seedling prevention. According to the incidence of autumn saplings such as stripe rust, powdery mildew and sheath blight, when the disease occurs seriously, carry out the spot protection. In the southern part of the stripe rust fungus winter area, the early disease field is treated with chemicals, and the chemical agent can be controlled by a triazole fungicide spray. Prevention and control should be carried out as early as possible in the seedling stage of sheath blight ; in the Weibei dryland area, Gansu Gandong area, southern Anhui area, southern Ningxia winter wheat area, on the basis of seed dressing prevention, attention should be paid to prevention and control of seedling stage aphids, prevention The occurrence of wheat yellow dwarf disease.
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Sigma Elevator Company is a subsidiary of Otis Elevator Korea (OEK) in South Korea for all overseas/export markets. It was founded in 2000.
Starting in 1968, "Goldstar" elevators, and later on, "LG" elevators, were counted among the world's top elevator brands. With the beginning of this new millennium, that legacy lives on through the birth of "SIGMA" elevators.
SIGMA Elevator Company will continue on with its mission of supplying elevators and escalators to more than 50 nations worldwide through its global network of 11 sales companies, 2 offices, and 52 agents or distributors.
SIGMA Elevator Company is dedicated to providing its customers with the best quality products and services. SIGMA elevators feature unmatched safety, ride comfort, and modern design. SIGMA escalators and moving walkways are held to similar safety and comfort standards and are integral parts of our modern urban aesthetics.
Changwon factory, Korea, the main factory of SIGMA Elevator, has long been a well-established name in the global elevator industry. SIGMA`s Dalian factory in China produces elevators & escalators to meet the demands of the local and worldwide markets as well.
SIGMA Elevator Company is committed to increasing customer value through a sharp focus on product innovation and customer satisfaction. With technology developed over the past 30 years, an enduring innovative spirit, and enthusiastic attitude towards providing customer value, Sigma Elevator Company stands by its product and service lines with confidence.
Sigma currently has businesses in more than 75 countries worldwide, and subsidiaries in five countries; Hong Kong (China), Vietnam, Thailand, Malaysia and Singapore.
In the United States, Sigma elevators were distributed by CemcoLift, which was a historic elevator company bought by Otis and based in Hatfield, PA. However, in 2012 CemcoLift has gone bankrupt and replaced by a new company called Minnesota Elevator Solutions.
It's headquarter, factory and testing tower are located in Changwon, South Korea, which are also operated by Otis Elevator Korea. It also has a secondary factory in Dalian, China, opened in 1998 to meet demands on Chinese elevator market.
In 2014, Sigma had a partnership with EXPRESS Elevator Co., Ltd., an elevator company based in Suzhou, China as well as a subsidiary of Otis. In 2016, Express/Sigma opened their headquarters in Suzhou, China
LG Elevators was the elevator and escalator division of LG Electronics. It was acquired by Otis in 1999 and was later known as LG-OTIS Elevator Company.
LG changed its name from GoldStar in 1994 after GoldStar merged with Lucky Chemical. In 1999, it was acquired by Otis Elevator Company, later known as LG-OTIS Elevator Company from 2000 until 2003, when it was renamed to OTIS-LG Elevator Company. Later in 2006, OTIS-LG was again renamed to Otis Elevator Korea.
LG-OTIS Elevator Company (later OTIS-LG Elevator Company then Otis Elevator Korea) was a joint venture company between Otis and LG Electronics` elevator and escalator division, LG Elevators in South Korea. It was formed in 2000. The brand was renamed to OTIS-LG Elevator Company in 2003 and later Otis Elevator Korea in 2006, where it is currently known as that in South Korea
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