Tomato virus disease is one of the most serious diseases of tomato. According to our survey for three consecutive years from 2001 to 2003, the diseased planting rate in the protection garden in our county was 60%, the diseased leaf rate was 45%, the open cultivation rate was 90%, and the diseased leaf rate was 70%; Occurrence area of ​​4200 acres, accounting for 70% of the total area of ​​6000 acres, reduce production by 60% -70%, direct economic losses of 30-40 million. There are three main symptoms of field symptoms: mosaic leaves appear yellow and green, or dark and light mottled, veins are transparent, the leaves slightly wrinkled anomalies, the diseased plants are slightly shorter than the healthy plants. The fern leaf-shaped plants are dwarfed to varying degrees, all of which become linear from the upper leaves, and the middle-lower leaves are slightly reeled upwards, and the corolla grows longer to form giant flowers. The streaked leaves, stems, and fruits are all susceptible to disease. The shape of the lesion varies depending on the site of its occurrence. It is yellow-brown spots or cloud spots on the leaves, and black-brown spots on the vines. The discoloration is only present. The surface tissue does not penetrate into the stem or fruit interior. Sources of pathogenic bacteria: There are more than 20 kinds of toxic sources that cause tomato virus, mainly tobacco mosaic virus and cucumber mosaic virus disease. Cucumber mosaic virus disease. Tobacco mosaic virus disease mainly causes tomato mosaic symptoms. Symptoms of streaking occur when exposed to high temperatures and intense light, or when mixed with Potato X virus; CMV occurs primarily in seasonally exposed and autumn greenhouse tomatoes, of which TMV is most common after late May, accounting for 30%, in addition to TMV and CMV co-infected sites 25%. Transmission routes and disease conditions Tobacco mosaic virus disease winters on various plants, and seeds can also be poisonous. It is the primary source of infection, and is mainly transmitted through sap-contact. As long as the host has a wound, it can invade, along with the tomato seed. The fruit can also be poisonous. In addition, the soil in the body, the host overwintering residues in the field, the tobacco after the test, tobacco, can be the initial infection of the disease. Cucumber mosaic virus disease is mainly infested by maggots, and sap can also be transmitted. Winter viruses mostly live on perennial weeds, and spring locusts migrate and transmit viruses. The incidence of tomato disease is light and heavy, and it is closely related to environmental conditions. In general, high temperature and dry weather are conducive to the occurrence of the virus. Excessive application of nitrogen fertilizer may result in soft tissue growth, thin soil, compaction, sticky weight, and poor drainage. The type of toxic source often changes periodically during the year, and the proportion of tobacco mosaic virus disease is greater in spring and summer, and autumn Mainly cucumber mosaic virus disease. Prevention and control countermeasures: Anti-tobacco mosaic virus is selected for disease resistant varieties, Jiafen No.15, Jiafen No.10, Zhongza No.9, Zhongza No.4, Zhongza No.5, and Zhongza No.6, Zaofeng, Xifen No. 3, Maofen 802 and so on. Seed and Soil Disinfection Disposal Seeds soaked in fresh water for 3-4 hours before sowing, and then soaked in 10% potassium phosphate solution for 40-50 minutes, washed with water and then germinated; or 0.1% Potassium permanganate was soaked for 30 minutes and the planting field was rotated for more than two years. Combined with deep turning, it promoted the decay of the virus-carrying debris, or applied lime, and promoted the inactivation of tobacco mosaic virus on the sick body in the soil. Formulated balanced fertilization technology to spray phytoalexin 7500 times to enhance the host disease resistance, increase the decomposed farmhouse fertilizer, generally Mushi farmyard fertilizer 6000 kg, urea 7-10 kg, potassium sulfate 20 kg, diammonium phosphate 20-30 Kilograms promote plant growth and disease resistance. Greenhouses were bred with seedlings for spring tomato seedlings, autumn tomatoes were sowed late, and seedbeds were screened with 60-mesh insect screens or silver-gray plastic films. The first water poured, seedlings seedlings prevent leggy, autumn tomatoes.
Our Heterocyclic Compounds has been developing from 2015 year, it is a relatively new class of compounds in our company. Our heterocyclic compounds conducted by a dedicated research and development teams. The R & D team focused on researching heterocyclic compounds, other products are performed by other technical team. Our goal is to catch up with the industry's professional heterocyclic manufacturer. At present our products are mainly composed of pyridine, pyrimidine, thiazole. In addition to our regular products, we accept any form of customized services, to undertake from grams to tons of production. After receiving inquiry, we will give a quotation within 2 working days with coa specifications,If you have special requirements, please provide details in the mail, we will combine the specific requirements and provide an accurate accounting of the costs of the offer. Under normal circumstances, we have the longest production cycle is not more than 45 days.
Heterocyclic Compounds
Heterocyclic Compounds,Cyclopropanecarboxylic Acid,Benzenedithiol Dihydrochloride
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