Nowadays, more and more farmers' friends have begun to plant vegetables in the shed. With the upgrading of various technologies, the greenhouse vegetables have begun to prepare for soil preparation and seedlings. The demand for pests and diseases that are prone to attack at the seedling stage needs more attention. First, four steps to start killing pests and diseases Low temperature shack After the greenhouse is built, select the sky cover film, seal the shed for 7 to 10 days, so that the temperature inside the shed will increase to 50 °C or above, in order to kill the surface bacteria and eggs, thereby increasing the infection of the vegetable development period. risk. In the low temperature shack, according to the greenhouse space per cubic meter of sulfur powder 2.4 grams, 4.5 grams of sawdust, dichlorvos smoked agent 1 gram average confusion, dark fire extinguished, sealed smoke, the consequences are better, but after smoking, pay attention to ventilation 2 ~3 days, planting again. 2. Seed disposal Pests and diseases are often lurking on the seeds or seedlings of vegetables, and seed disposal is carried out before sowing, so that the transmission of local pests and diseases can be eliminated. Commonly used seed disposal methods are warm water soaking and pharmaceutical disposal. When soaking in warm water, the vegetable seeds are usually immersed in warm water at 50-60 ° C for 5 to 15 minutes, and the seeds are occasionally stirred during soaking, so that the seeds are heated evenly. 3. Soil disinfection Before sowing or planting, disinfection of the soil in the greenhouse to kill the bacteria or eggs in the soil can prevent or increase the risk of pests and diseases during the development period of the vegetables. When the soil is disinfected, the dosage and dosage can be selected according to the state of the disease and pests in the whole year. When using, add the excess amount of fine soil to the selected agent, mix it evenly on the surface, and then plow it into the soil. 4. Set up insect nets to stop beneficial insects, set yellow boards, light traps and beneficial insects In the process of vegetable seedling cultivation or development, an insect-repellent net is set up to prevent beneficial insects from moving into the greenhouse. The insect-prevention and disease-preventing consequences are very clear, and the equipment greenhouse can be selected for 40 mesh. The yellow plate can be made of 6cm×4cm rectangular cardboard, coated with yellow lacquer and then coated with 1 layer of engine oil. It is hung in the shed. The common ineffective planting area is 667m2, hanging 30~40 pieces, trapping the consequences of mites and whitefly. Good; at the same time, black light can be used to trap the adult worm and adult tiger; the indoor vibrating insecticidal lamp has a strong insecticidal effect on a variety of beneficial insects. Second, planting planting based on the basis In the formulation and implementation of planting methods, it is necessary to consider the premise of inducing the development and development of vegetables and not conducive to the propagation of pests and diseases, in order to reach the goal of prevention and aggravation of pests and diseases. 1. Selection of resistant (resistant) pests and diseases: It is the most economically ineffective way to control greenhouse pests and diseases. 2, the implementation of soil testing formula fertilization: the application of adequately decomposed organic fertilizer, for the differential plots affirm the ratio of NPK. In the middle and late stages of vegetable development, it is necessary to pay attention to the application of phosphorus and potassium fertilizer and other micro-fertilizers to strengthen the disease resistance of vegetables. 3, superstition watering: vigorously promote drip irrigation and under-film dark irrigation techniques, ban flood flooding, to lower the soil and atmospheric humidity. 4, fair planting: according to the type of difference, certainly the planting density of fairness, to avoid planting too dense, affecting the wind and light. 5, the implementation of the mulch film cover technology: all the air in the greenhouse to cover the film cover, not only can strengthen the ground temperature, improve root development, and can reduce the atmosphere humidity in the low shed, aggravate the disease. 6. Pay attention to the clean room: remove the diseased plants in real time during the vegetable development period, remove the diseased leaves and old leaves, and clear the dead leaves, roots and weeds in the greenhouse after sowing, which can invalidate the development period and the next. The source of infection of vegetable pests and diseases. 7, strengthen the light: vegetable development period should adhere to the shed film clean to enhance the light. 8, fair rotation. The same vegetables have opposite or similar pests and diseases, so it is best to carry out cropping in greenhouses to increase the incidence of pests and diseases. III. Measures for the prevention and control of pests and diseases in greenhouses 1. Prevention and treatment of secondary pests and diseases of pepper Secondary pests and diseases during the seedbed period. The primary disease is gray mold and anthrax. The prevention and treatment were carried out with the use of succulent and methyl thiophanate, and the liquid was sprayed every 15 days. The second pest is a locust, which can be controlled by drugs such as enemy cockroaches and gram. Development of secondary pests and diseases during the consequences period. The diseases are secondary: fungal scab, anthrax, and epidemic diseases can be killed or methyl thiophanate, treasant or chlorothalonil; viral diseases usually cause mosaics, leaf rolling, available virus A or pepper rolls Ye Ling spray defense; white rickets, green diseases are heavily prepared, strengthen soil disinfection, and apply more lime. In the early stage of the disease, 5% carbendazim 500 times solution was identified for prevention and treatment. 2. Eggplant secondary pest control Secondary disease. 1 In the early stage of seedling, it is easy to develop rickets and fungal diseases. The anti-disease agents include Suikening, methyl thiophanate, and chlorothalonil. 2 The disease after development and development has verticillium wilt and cotton blight. The control is heavy in rotation, severe soil disinfection, and heavy lime application. At the beginning of the disease, it can be controlled by killing spray. Secondary pests. There are secondary mites, cotton bollworms, eight-star ladybugs, and samovars. Aphids can be controlled by drugs such as enemy cockroaches and dimethoate; cotton bollworms, eight-star ladybugs are controlled by drugs or nails; and samovar is controlled by ketone and ketone. 3. Chinese cabbage pest control There are many diseases, but the most common and severe attacks are soft rot, downy mildew and viral diseases. 1 soft rot, in the early stage of the disease, the diseased plants are removed in real time, and a large amount of lime is scattered in the surrounding soil; 2 downy mildew, the following agents can be used in the early stage of disease: 75% metalaxyl 800 times spray, 40% ethyl phosphorus aluminum 150 -200 times spray; 3 virus disease, timely control of aphids in the seedling stage, 1000 times spray with pymetrozine. Prevention and control of pests. Insect pests, such as cabbage caterpillars, beet armyworms, aphids and other pests, can be controlled by enemy killings, salt and other chemicals. 4. Lettuce pest control The diseases of lettuce are secondary: downy mildew and soft rot. 1 Downy mildew, sprayed with 25% metalaxyl 800 times or 45% dexamethasone 900-1000 times in the early stage of the disease, sprayed once every 5-7 days, 2-3 times. 2 Soft rot, in the early stage of the disease, the diseased plants are removed in real time, and a large amount of lime is scattered around the diseased point. At the same time, 200 g/L of Ag streptomycin or 500-1000 times of Dixon or 500% of Dysonium 800 can be used. - 1000 times liquid spray, spray once every 5-7 days, 2-3 times. The secondary pests of lettuce are aphids and snails. Identify and control with acetamiprid and squirming. 5. Pest control of celery Disease. In the seedling stage, there is a smashing disease, inventing the diseased plant, clearing it in real time, and spreading the soil. It can be sprayed with 35% carbendazim fine soil 25 kg, or sprayed with 50% carbendazim 1000 times solution or 50% dexamethasone 1000 times solution or 70% chlorothalonil 800 times solution. The adult disease is secondary to leaf blight and early blight. It can be sprayed with 70% dasen zinc wettable powder 500 times solution and 40% methyl thiophanate 600-800 times solution, and can be used for 5-7 days. Secondary pests. The celery pests are secondary to Spodoptera litura and aphids. Spodoptera litura can be controlled by 25% chlorfenapyr No. 3, 500 times solution or Gongfu or Jiawei. Aphids can be controlled with a single dose of piperidone or imidacloprid. 6. Cucumber pest control Disease. Secondary diseases include luxuriant diseases, epidemics, downy mildew, bacterial angular spot disease, which can be distinguished from the use of dexamethasone, chlorpyrifos, metalaxyl, and agricultural streptomycin. Secondary pests. There are yellow stalks, mites, etc., which can be sprayed with drugs such as enemy or pyrethroids. 7. Loofah pest control The secondary disease of loofah has diseases such as blight, blight, and bacterial angular spot; the pests are secondary to aphids, yellow stalks, spotted flies and melons. The prevention and control measures shall be implemented in accordance with the prevention and control measures for melons 8. Pest control of bitter gourd Bitter gourd plants have a special breath, strong ability to resist pests and diseases, but anthrax and brown spot disease often occur at low temperature and rainy season; 70% methyl thiophanate 800-1000 times liquid or 75% chlorothalonil 800 can be used Double liquid spray control. In the dry season, it is vulnerable to beneficial insects such as aphids and whitefly. The control of aphids can be controlled by spraying with 25% pymetrozine 800 times. The control of whitefly can be controlled by spraying with 20% imidacloprid 500 times. 9. Prevention and treatment of winter melon pests and diseases The secondary disease of melon is blight. Prevention and control of swine blight comprehensive control, selection of disease-resistant species, implementation of crop rotation, sorghum planting. Drug control can be sprayed or rooted with 70% thiophanate-methyl 1000 times solution or 50% carbendazim 800-1000 times solution or 75% chlorothalonil 500-800 times before and after flowering. Insect pests, if aphids, can be controlled by imidacloprid or pymetrozine spray. 10. Bean pest control The secondary diseases of beans include luxuriant diseases, rust, and coal mold diseases. It can be used for the control of dysentery, methyl thiophanate, and senseng zinc; the insect pests are secondary to aphids, pea pods and Liriomyza sativae. Efficient, low-toxic, safe pesticides such as yinbao, cadherin, avermectin and xixi can be used to control the beneficial insects in the low age. The above is the key points of various planting techniques for greenhouse vegetables brought by Xiaonong.com, and farmers who need it are welcome to make serious reference. Glutathione Powder,L-Glutathione Reduced Powder,Cosmetic Grade L-Glutathione Powder,Whitening L-Glutathione Reduced XI'AN PLANT BIO-ENGINEERING CO.,LTD , https://www.plantbic.com
Glutathione powder plays an important role in preventing oxidative damage to the skin.In addition to its many recognized biological functions, glutathione has also been associated with skin lightening ability. The role of glutathione as a skin whitener was discovered as a side effect of large doses of glutathione. Glutathione utilizes different mechanisms to exert its action as a skin whitening agent at various levels of melanogenesis. It inhibits melanin synthesis by means of stopping the neurotransmitter precursor L-DOPA's ability to interact with tyrosinase in the process of melanin production.Glutathione inhibits the actual production as well as agglutination of melanin by interrupting the function of L-DOPA. Another study found that glutathione inhibits melanin formation by direct inactivation of the enzyme tyrosinase by binding and chelating copper within the enzyme's active site. Glutathione's antioxidant property allows it to inhibit melanin synthesis by quenching of free radicals and peroxides that contribute to tyrosinase activation and melanin formation. Its antioxidant property also protects the skin from UV radiation and other environmental as well as internal stressors that generate free radicals that cause skin damage and hyperpigmentation. In most mammals, melanin formation consists of eumelanin (brown-black pigment) and pheomelanin ( yellow-red pigment) as either mixtures or co-polymers. Increase in glutathione level may induce the pigment cell to produce pheomelanin instead of eumelanin pigments. A research by Te-Sheng Chang found lowest levels of reduced glutathione to be associated with eumelanin type pigmentation, whereas the highest ones were associated with the pheomelanin. As a result, it is reasonable to assume that depletion of glutathione would result in eumelanin formation. Prota [ observed that decreased glutathione concentration led to the conversion of L-Dopaquinone to Dopachrome, increasing the formation of brown-black pigment (eumelanin).