Distinguishing and Prevention of Tomato Virus Disease, Tea Camel and Hormone Poisoning
Feature description and prevention methods Symptoms of tomato virus disease on the top leaves of the plants are easily confused with hormonal poisoning and the hazards of the tea plant. Once a diagnosis is made, it will not only delay prevention but also cause more damage to the plant due to wrong use of medicine. Viral diseases often have three manifestations in tomato: mosaic virus disease, fern leaf virus disease and streak virus disease. Mosaic virus disease: yellow and green leaves appear on the leaves, veins are transparent, leaves slightly shrunken. Fern leaf-type virus disease: The plants are dwarfed to varying degrees, and all or part of the upper leaves become linear, and the middle and lower leaves are slightly rolled up, and the corolla grows longer, forming giant flowers. Stripe type: the upper leaves are initially mosaic or yellow-green, and then the dark green in the middle of the stem is submerged in short stripes, followed by deep brown subsidence, oily necrotic streaks, and gradually spread around, resulting in the diseased plant wilting and dead. In view of the confusing characteristics of viral diseases and hormonal intoxication and tea damage, experts summarized the following points for the diagnosis of viral diseases: The first is to see the distribution of fields. Tomato virus disease in the shed is generally not a single occurrence, but is sporadic; tea leaves are mostly spotted; hormonal intoxication occurs as a whole, and there is a trend from heavy to light in the field. The second is to look at the site of the plant. The damage of tomato virus disease and tea-scented aphid mainly occurred on the young leaves on the top of the plant; and the hormone poisoning mainly occurred on the young leaves near the spray flowers and the young leaves on the top of the plants; 2,4-D Herbicides harmed the whole plant, but the young leaves were heavy. The third is to look at the symptoms: 1, virus disease. It is mainly transmitted by insects such as aphids and migratory locusts, or the seeds are poisonous, and agricultural operations are used to transmit viruses. The affected plants were first slightly chlorotic but not clear veins in the veins of the heart, and gradually changed to shrinkage of the leaves, and later the leaves were thickened. The main vein brown is necrotic and spreads to the lateral branch, main stem and growth point. The edge of the leaf curls toward the front of the leaf and forms a "buckle", which generally curls both the old leaf and the old leaf. The victim suffers from dark green and light green long spots with verrucous processes. 2, tea yellow tea. With tenderness, when the feeding site grows older, it immediately shifts to the new, tender site. Chengyu and Ruoqiang are feeding on the back of young shoots and young leaves, which cause the leaves to fade into green veins and veins. The affected areas have oily luster and are gray-brown or yellow-brown. The leaf margin curls toward the back of the leaves, forming a " "Under the bucket," the tender stems are distorted and willow-like. When the fruit is damaged, the surface of the pedicel and sepals is grey to grayish brown, loses luster, and becomes corky and hard. The cockroach is very small and not easily noticeable to the naked eye, but it can be observed with a magnifying glass. 3, hormonal poisoning. It is mainly sprayed with overdose of 2,4-D, anti-dropping agent, herbicide and so on, which causes the top leaves (including main stems and branches) to have abnormal leaves, shrink, harden, and become brittle. Mainly on the leaves, the leaves are generally curled up and stiff, and when severe they are "chicken claws." The veins are relatively heavy, and the leaves of weak plants often appear to curl in the greenhouse. The more the flowers are, the heavier the curls are. Hormone poisoning occurs when the leaves shrink and curl, their color is unchanged or greener. Prevention: 1, hormone poisoning: hormone use (1) to see the temperature. Use a lower concentration when the temperature is high, and a slightly larger concentration when the temperature is low; (2) Look at the growth of the plant. The growing trend is strong, the concentration of medication should be large, the growth is weak, and the concentration should be smaller. (3) Be careful not to sneeze the liquid to the young leaves or growing points. Do not repeat the flowering or spraying. Add pigment as a marker to the liquid. (4) After poisoning, foliar spray of natural brassin, Tianda 2116 or 0.2% rare earth micro-fertilizer + 0.3% gibberellin aqueous solution, etc., to alleviate symptoms of poisoning. 2, virus disease: (1) selection of disease-resistant varieties. Choose the appropriate type of disease-resistant products grown locally, such as Silver Collar 218, HL108, HL2109, etc. (2) Seed disinfection. Use 0.1% potassium permanganate solution or 10% tribasic sodium phosphate solution to soak for 20 minutes, wash and soak germination. (3) Scientific cultivation. Cultivate healthy and disease-free pests; use mulching, pest control nets and other measures, early colonization, early results; reasonable fertilization, increase organic fertilizer, foliar spray fertilizer; timely watering, cultivating loose soil, remove the center of the disease. (4) Chemical control. Mice sprayed with imidacloprid, acetamiprid and other agents to control aphids, planthoppers; seedling stage or after planting can be sprayed with 20% of the virus A wettable powder 500 times or 50% bacteria poisoning 200 times and so on. Spray once every 10 days and spray 3-4 times. 3, tea yellow wolfberry: (1) agricultural control. Remove weeds from the field and weeds in the field, level land, and destroy overwintering sites to eliminate overwhelming insect sources. Planted healthy seedlings, timely cultivating and weeding, removing litter and reducing the source of insects. (2) Chemical control. Immediately after the onset of symptoms, it was possible to use an acaricide of 1.8% abamectin (3000 mg) or 15% fenone ketone EC 300 times. When spraying, focus on the young part of the upper part of the plant, especially the back of the young leaf and the tender stem. Note alternating medication, 7 to 10 days once, continuous control 2 to 3 times. 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