Small tigers: Common names such as silkworm, silkworm, and cutworm are distributed in various tobacco areas in our province. In the seedling stage, the small tigers mainly bite the stems with larvae, resulting in lack of seedlings. The adult larvae are 18 to 20 mm long, with a brown head and chest and a tan brown fore. The hind wings are nearly triangular. The newly hatched larvae are gray-brown, yellowish green before the third instar, and turned gray-brown after the third age. Old mature larvae are cylindrical. Adults have strong flying power, strong phototaxis and chemotaxis, and like sugar and acid odor. Control method: Firstly, weeds should be removed, and the seedbed used for seedling should be ploughed and sun-dried as soon as possible to reduce larvae and mites in the soil. The second is to trap the adult, using the phototaxis and chemotaxis of the adult, in the adult stage can be used to light trap or kill with sweet and sour liquid (sugar 3 points, vinegar 4 points, wine 1 point, water 2 points) to reduce the oviposition source . Once again, the larvae are caught. Every morning, before watering and before the seedlings, pay attention to the turf of the topsoil around the victim. For the prevention and treatment of pesticides, the seedling bed is sprayed with Kung Fu 2000 times liquid or 2.5% enemy killing 2500 times in the evening, so that it can be poisoned after biting.
Oriental è¼è›„: The common name is the local dog, which is distributed in all tobacco areas in our province. Tobacco seedling beds are mainly harmed on tobacco. Oriental cockroaches feed on tobacco seeds, radicles, young stems and roots in adults. The mites are numb-like after being killed, causing the tobacco seedlings to die. Digging tunnels on the soil surface, cutting off the seedlings or separating the roots of the tobacco seedlings, causing the water seedlings to lose water and die. The adult body is 27 to 35 mm long and is yellowish brown. The fore wing is short and the hind wings are developed; the forefoot is excavated. The nymph is shaped like an adult. Adults and nymphs overwinter in the soil chamber. In the spring and warm season, the ground temperature rises and then begins to rise to the topsoil activity. Adults have strong phototaxis, chemotaxis, and fecal faecal properties. They are particularly fond of sauteed bean cakes and wheat bran. Organic substances such as unfertilized sputum are also very attractive to cockroaches. In the early spring, the temperature is high and the rainfall is large. Control methods: mainly based on agricultural control, ploughing the soil in winter and spring. The effect of bed soil fumigation before planting is good. The insects and nymphs are trapped and the nymphs use the black light to trap the adults; the pits are piled up and the horses are sucked and killed.
Wild donkey: The common name is dried snail, which is a mollusk. Before the Great Cross, the wild locusts mainly harmed the growth point of the tobacco seedlings. Later, the leaves were mainly fed, so that the leaves were nicked and holed. In severe cases, only the leaves were left in the leaves. Control method: Because the wild donkey likes to live in a humid place, choose a sunny, well-drained field for seedbeds. It can be controlled by using oil tea dry or skin whistle (1:40) soaking solution, and it can also be controlled by 6% Milda granules at 1 g/m 2 with dry fine sanding. In the evening, the cabbage or lotus white leaves can be scattered on the seedbed, and the tea can be collected in the morning to disinfestation.
Haze: Also known as the peach aphid, the common name is worm. Yunnan has a mild climate. “There is no cold in winter and no heat in summer.†After the tobacco harvest in autumn, the haze is transferred to rapeseed, vegetables and some weeds. After tobacco planting in February-March of the following year, the haze was transferred to tobacco. The aphids concentrate on the heart of the tobacco seedlings to suck the juice, causing the leaves to curl and affect the normal growth of the tobacco seedlings. Aphids also transmit tobacco virus disease. Control method: cover the seedbed with a 40-mesh nylon gauze, or spray the insecticide with a 10% imidacloprid wettable powder 3000 times.
Oriental è¼è›„: The common name is the local dog, which is distributed in all tobacco areas in our province. Tobacco seedling beds are mainly harmed on tobacco. Oriental cockroaches feed on tobacco seeds, radicles, young stems and roots in adults. The mites are numb-like after being killed, causing the tobacco seedlings to die. Digging tunnels on the soil surface, cutting off the seedlings or separating the roots of the tobacco seedlings, causing the water seedlings to lose water and die. The adult body is 27 to 35 mm long and is yellowish brown. The fore wing is short and the hind wings are developed; the forefoot is excavated. The nymph is shaped like an adult. Adults and nymphs overwinter in the soil chamber. In the spring and warm season, the ground temperature rises and then begins to rise to the topsoil activity. Adults have strong phototaxis, chemotaxis, and fecal faecal properties. They are particularly fond of sauteed bean cakes and wheat bran. Organic substances such as unfertilized sputum are also very attractive to cockroaches. In the early spring, the temperature is high and the rainfall is large. Control methods: mainly based on agricultural control, ploughing the soil in winter and spring. The effect of bed soil fumigation before planting is good. The insects and nymphs are trapped and the nymphs use the black light to trap the adults; the pits are piled up and the horses are sucked and killed.
Wild donkey: The common name is dried snail, which is a mollusk. Before the Great Cross, the wild locusts mainly harmed the growth point of the tobacco seedlings. Later, the leaves were mainly fed, so that the leaves were nicked and holed. In severe cases, only the leaves were left in the leaves. Control method: Because the wild donkey likes to live in a humid place, choose a sunny, well-drained field for seedbeds. It can be controlled by using oil tea dry or skin whistle (1:40) soaking solution, and it can also be controlled by 6% Milda granules at 1 g/m 2 with dry fine sanding. In the evening, the cabbage or lotus white leaves can be scattered on the seedbed, and the tea can be collected in the morning to disinfestation.
Haze: Also known as the peach aphid, the common name is worm. Yunnan has a mild climate. “There is no cold in winter and no heat in summer.†After the tobacco harvest in autumn, the haze is transferred to rapeseed, vegetables and some weeds. After tobacco planting in February-March of the following year, the haze was transferred to tobacco. The aphids concentrate on the heart of the tobacco seedlings to suck the juice, causing the leaves to curl and affect the normal growth of the tobacco seedlings. Aphids also transmit tobacco virus disease. Control method: cover the seedbed with a 40-mesh nylon gauze, or spray the insecticide with a 10% imidacloprid wettable powder 3000 times.
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