The natural spread of Tomato spotted wilt virus among host plant plants is mainly transmitted through the thrips media in a persistent manner. The virus replicates and proliferates in the body of vector insects to increase the transmission efficiency. At least 9 species of thrips have been reported so far, of which Western floes are the most important mediators. At the same time, high temperatures and droughts are conducive to the occurrence and spread of spotted wilt disease. Poor management in the field, and diseased healthy plants in sub-seedlings, fixed seedlings, pruning and other agricultural operations are frictional and collidable with each other, which can easily lead to morbidity. The incidence of field-grown weeds is more weight. 1. Transmission of the wilt virus disease Viruses can spread with juices and seeds. In addition, smoke thrips, pupa horses, hummocks, tobacco brown thrips, and thrips can all be used for persistent drug transmission. Thrips can only acquire the virus during larval stages. Viruses need to be reproduced in the body. Onion thrips can pass the virus only after 5 to 10 days into adults. The shortest period of poisoning for thrips is 15 to 30 minutes, and that of sturgeon takes 30 minutes. When the time is long, the efficiency of virus transmission increases. Once a humming horse is poisoned, the virus is transmitted for up to 20 days, and it has the ability to transmit virus for life. Virus inoculation is mostly obtained when the superficial epidermis of tomato leaf cells is sucked on food. It usually occurs after 4 days of incubation. 2. Period of illness and symptoms 2.1 Young leaves infected at the seedling stage became coppery, rolled up, and formed many small dark spots. The leaves were purple along the veins, some of the growth points were necrotic, brown necrotic streak was formed on the stem ends, and only half of the diseased plants grew or were completely short Stasis or wilting occurs, and the onset can lead to ineffective tomatoes. 2.2 The chlorotic ring spots appear on the fruits infected with green fruits. The green fruits are slightly convex and the ring veins are not obvious. The brown fruits have brown necrotic spots on the green fruits and appear as knob-like protrusions, and the fruits are easy to fall off. 2.3 mature fruit lesions lesion ring obvious, red and yellow or red and white, chlorotic spots in the panchromatic phase, severe whole fruit contraction, late lesions brown necrosis, umbilical symptoms and umbilical rot similar, but The epidermis brown necrosis of the diseased fruit is different from the umbilical rot disease. 3. Control methods 3.1 The use of resistant varieties can be used for anti-TMV varieties, such as Jiafen No.15, Zhongza No.7, No.9, Maofen No.802, Xifen No.3, Yanfen No.1, Zheza No.7, No.5 Fanfan No.5, etc. New varieties. 3.2 Cultivation of Disease-free Strong Seedlings Families should be fumigated before they are used. They can use 15% isoprocarb, 200-300g/mu; they can eliminate weeds and plant sensitive plants around them to reduce the number of thrips and control the source of infection. At the same time, regular monitoring of the Hummer was conducted and timely prevention and control was conducted Hang yellow and blue armyworm boards in the hangar to prevent and control them. Cultivating disease-free strong seedlings, timely removal of diseased plants, and distance from tobacco fields are all important preventive measures. 3.3 Management of tomato seedlings and post-planting Since it takes a certain period of time for the virus to be transmitted after the virus is obtained, it is found that the thrips are promptly treated with insecticides to prevent insects and prevent disease. It is possible to use 10% pestochlorinated EC 2000 times , or 5% fipronil suspension 1500 times, or 10% imidacloprid wettable powder 2000 times, or 2.5% vegetable suspension 1000 times, or 1.8% abamectin 2500 times, or 0.3% It is sprayed with 600 times solution of Alizarin EC, or 25% solution of Aqueduct, 2000 times solution of water dispersible granules. The liquid sprayed to the base of the stem has a better effect of killing the parasites parasitizing in the rhizosphere. 3.4 Strengthen cultivation and management After the harvest, the sick plants and indoor and outdoor weeds in the shed are promptly removed, and the virus and diseases of the open field vegetables and the control of the locusts are done well. Proper sowing and cultivation of disease-free strong seedlings. In the tomato seedlings, planting, binding vines, snoring before spraying 1% soapy water plus 0.2% to 0.4% of potassium dihydrogen phosphate or 1:20 to 40 milk or soybean milk powder to prevent contact infection. Hand and tools in agricultural operations should be promptly disinfected. 3.5 Prevention and control of locust sheds hang insect nets to prevent the entry of venomous worms, or hang silver-gray plastic film strips and aluminized polyester reflectors to avoid snaking. Found locusts timely spraying control. 3.6 Biological methods and comprehensive control The use of blunt blister can effectively control the number of western flower thrips and release 200 to 350 heads/m2 of obtuse burrs every 7 days in the greenhouse, which can completely control thrips damage. The release of florets also has good results. These natural enemies can take pollen in the absence of food, so the effect is long-lasting. Tomato covered with aluminum film can reduce 33% ~ 68% of the thrips, the incidence of spotted wilt virus disease can be reduced by 60% to 78%. 3.7 Chemical control spraying 5% bactericidal agent WP 400 times or 0.5% antitoxic agent No. 1 (mushroom proteoglycan) 300 times liquid agent, 20% poisonous nemesis wettable powder 400 to 500 times solution, 83 increase resistance 100 times liquid agent, plant virus inactivation agent 912, 75g per 667m2 powder, 15kg water spray, in addition can also choose to use attenuated vaccine N14 and satellite ribonucleic acid S52, to prevent TMV, CMV and compound infection have a certain effect.
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