There are many types of pests in the flue-cured tobacco seedbeds in Yunnan tobacco fields. According to the survey, there are 9 species, but there are 4 major pests, ie, small tigers, earthworms, wild locusts and aphids. The following describes the occurrence and control methods of these four kinds of pests during the seedling stage of flue-cured tobacco: Small tigers: Common names such as silkworm, silkworm, and cutworm are distributed in various tobacco areas in our province. During the seedling stage, the ground tiger mainly cut off the tobacco stem with larvae, resulting in lack of seedlings. Small tiger adult body length of 18 to 20 mm, brown head and chest, fore-wing brown. The rear wing is nearly triangular. The newly hatched larvae are gray-brown, yellow-green before age 3, and turn grayish brown after age 3. Mature larvae are cylindrical. Adults have strong flying ability, strong phototaxis and chemotaxis, and they prefer sweet and sour odor. Control methods: The first step is to remove weeds and use them as nursery beds for plowing and sun drying to reduce larvae and mites in the soil. Followed by trapping adult worms, using the phototaxis and chemotaxis of adults, light trapping or trapping with sweet and sour liquid (3 sugar, 4 vinegar, 1 wine, 2 water) can be used to reduce the source of spawning during adulthood. . Once again, the larvae are caught. Every morning, before watering and seedlings, pay attention to removing the larvae from the top soil around the victim plants. Pharmacy control, seedling stage in the evening with kung fu 2000 times or 2.5% enemy killed 2,500 times foliar spray, let it die after poisoning death. Oriental Stork: The common name is Earth Dog, which is distributed in all tobacco areas in our province. Tobacco mainly harms tobacco seedbeds. Oriental cockroach eats tobacco seeds, young roots, young stems, and rhizomes in the soil with adults and nymphs. After being damaged, it becomes messy, causing the tobacco seedlings to wither and die. Digging tunnels on the soil surface, cutting off seedlings or separating roots and soil from tobacco seedlings causes the seedlings to lose water and die. Adult body length 27 to 35 mm, brown. The forewings are short and the hind wings are well developed; the forefoot is excavated. Nymphs resemble adults. Adults and nymphs in the soil in the winter, in the spring season, after the temperature rises, it began to rise to the topsoil activities. Adults have a strong phototaxis, chemotaxis, and fecal characteristics. They are particularly fond of sauteed soybean cakes, wheat bran, and other organic materials such as uncooked earthworm excrement. They also have strong attraction to earthworms. In the early spring when the temperature is high and the rainfall is heavy, the Oriental Dragonfly is a serious problem. Control methods: mainly agricultural control, winter and spring season, plowing the soil. Before bed sowing, the treatment of bed smoldering is good. Induction and killing adults, nymphs use the phototaxis of tendons, and tending to feces. Adults are hunted and killed with black light lamps; Nojiri: The common name is Narumi, a mollusk. Before the Great Cross period, the wild leeches mainly affected the growth point of the tobacco seedlings. After that, they mainly took the leaves so that the leaves were nicks and holes, and when the leaves were severe, only the leaf veins remained. Prevention methods: Because the wild eel likes to live in a humid place, so choose sunny, well-drained soil for seedbed. With oil tea dry or leather whistle (1:40) soaking liquid control, but also can be used 6% Mi Da granules by 1 g / m 2 mixed dry sand sprinkler control. It is also possible to disperse white cabbage or white lotus leaves on a seedbed in the evening and collect tea leaves in the morning to exterminate insects. Cigarette smoke: also known as peach aphid, common name tired insects. Yunnan has a mild climate, “no cold winter, no summer heat,†and after the autumn tobacco harvest, the haze transferred to rape, vegetables, and some weeds. After tobacco was sown from February to March in the following year, the tobacco smoke was transferred to tobacco and harmed. Aphids are concentrated on the heart and leaves of tobacco seedlings and suck the sap, causing the leaves to curl, affecting the normal growth of tobacco seedlings. Aphids also spread tobacco virus disease. Control methods: Cover the seedbed with a 40-mesh nylon gauze, or spray pesticidal 3000 times with 10% imidacloprid wettable powder.
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