Tomato yellow leaf curl virus disease is mainly transmitted by B. tabaci. The symptoms are as follows: When tomato plants are infected with virus, they mainly exhibit growth retardation or stagnation, internode shortening, plant dwarfing, and leaves becoming smaller and thicker. Hard, wrinkled, upward curled leaves, leaf edge to vein yellow area, the symptoms of the upper part of the leaves of the plant typical, the lower part of the old leaves symptoms; late fruiting performance is less, the fruit becomes smaller, slow expansion, mature fruit can not be normal Turn color. After infected with the virus, tomato plants, especially before flowering, were infected with the virus. The fruit yield and commodity value were greatly reduced. The loss caused by serious diseases was 100%, which was one of the most serious diseases that affected tomato yield.
Precaution:
First, the cultivation of disease-free insect-free seedlings is the key. The earlier the tomato disease infestation of the disease, the higher the incidence rate, so the prevention should be grasped from the nursery period, so that early prevention and early control, and strive to reduce the incidence of disease or not. To remove weeds from the seedbed, clean the seedbed soil to reduce the source of the disease. Seed soaking with 806 plant growth fluid or gene activator. The seedbed was sprayed with 806 plant growth solution and sprayed at 300 times, and was isolated with a 40- to 60-mesh insect net.
Second, timely control of the occurrence of Bemisia tabaci. Tomato yellow leaf curl virus disease is transmitted by whiteflies. Bemisia tabaci migrates in the field. We should strengthen the management of pruning and chemical control in the field, and reduce the migration of whiteflies between adjacent fields. We should use a chemical to prevent and control tobacco once every 7 to 10 days. The pesticides can be selected from imidacloprid and acetamiprid. , Fluoxetine, Manganese Emulsion, etc., and pay attention to rotation.
Third, agricultural measures. Appropriately control the amount of nitrogen fertilizer on the cultivation and keep the field moist. Irrigation with fertilization is done a small number of times, so as to avoid drought or drought, timely release of air, avoiding high temperature in the greenhouse, regulating the temperature and humidity in the field, increasing organic fertilizer, promoting plant growth and robustness, and improving the disease resistance of the plants to remove field crops in time. Grass and debris leaves to reduce the source of insects. Pay attention to field management to prevent contact infection. When tying vines, pruning, snoring, sticking flowers and picking fruits, you should first dispose of the healthy strains, treat the diseased strains afterwards, and pay attention to the use of soapy water or trisodium phosphate solution to fully clean the hands and tools. , Reduce human transmission, find diseased plants in time, and reduce the virus source.
Fourth, implement rotation for change. Severely affected areas should have more than three years of rotation with other crops outside Solanaceae. For example, planting cucumbers, beans, grapes, etc. to avoid intercropping and continuous cropping, reduce and avoid virus transmission of tomato virus disease soil and residues, and reduce the occurrence of virus diseases; nursery sites and planting sheds should be thoroughly cleared with toxic Grass, reduce the source of virus disease; promote formula fertilization technology, spray more love or plant treasure, to enhance host resistance to disease.
Fifth, pharmaceutical control. Before the seedlings are sown, planted, tied, and smashed, spray 1% soapy water with 0.2%-0.4% potassium dihydrogen phosphate or 1:20-40 soy milk or soymilk powder to prevent infection. Spraying NS-83 increasing agent 100 times before and after colonization can enhance tomato disease resistance. In the initial stage of onset (5-6 leaf stage), spray protection is started. The agent is 3.85% virus virus 500 times liquid for foliar spray. After the drug is sprayed for 7 times every other day, 3 consecutive sprays; 1 can also be used. .5% Phytolactin 800 times, or 20% of the virus A500 times spray, use the same method; 2% can also be used grams of grams of water emulsion 250 times every 7 days sprayed 2-3 times.
Digestive diseases are disorders of the digestive tract, which is sometimes called the gastrointestinal (GI) tract.
In digestion, food and drink are broken down into small parts (called nutrients) that the body can absorb and use as energy and building blocks for cells.
The digestive tract is made up of the esophagus (food tube), stomach, large and small intestines, liver, pancreas, and the gallbladder.
A digestive disease is any health problem that occurs in the digestive tract. Conditions may range from mild to serious. Some common problems include heartburn, cancer, irritable bowel syndrome, and lactose intolerance.
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