In recent years, the poplar industry has developed rapidly, especially for fast-growing poplars. It takes more time to plant afforestation in the fall or spring, and it is particularly important to prevent and control sprouts. The heaviest damage pests to sprouts in early spring are black cashmere beetles. Big gray elephant armor. Three kinds of Mongolian catfish. In the early spring drought, it is easy to occur in a large amount, and young shoots of poplar are often eaten away, which seriously affects the survival rate of afforestation. First, the life history and habits of three kinds of pests 1. Black cashmere beetle Coleoptera chafer family. One generation occurred in 1 year, and the adults passed winter in the soil. In the first half of April, the adults were exhumed, and the weeds that had germinated earlier were first fed and gradually spread later. From late April to late May it is a period of high incidence. Adults often unearth activities in the evening or at night, lurking in the earth seams during the day, and have phototaxis and suspended animation. The eggs are laid in mid-May and the egg masses are produced in a depth of 16-20 cm. Newly hatched larvae emerged in mid-June. In early August, older larvae penetrated into 40-50 cm soils to make earthworms. About 10 days of the pupa period, the newly emerged adult lurks underground. 2. The large gray elephant is a Coleoptera, like a weevil. It takes 2 generations to get winter and adult larvae in the soil. In the middle and late April, the adult was unearthed during the wintering period, and the colonies were fed and copulated in the eyes of the seedlings. Adults laid eggs on leaves in late May and hatched as larvae after early June. In late September, the larvae make up the winter nest. After the spring of the following year, we continued to feed until the first half of June, and we eced in mid-July. The new adult was overwintering in the same place. From the hatching of eggs to the emergence of adult worms, the adult lays eggs again, which lasts for 2 years. Adults cannot fly and rely on crawling activities. When the temperature is low at the beginning of April, it is latent in the interstices of the clods or under the plant stumps. In case of rain, some adults died of mud sticking. Adults have concealed and suspended animation, and the feeding time is mostly before 10 o'clock and evening, and the most is from 16 to 22 o'clock. The female lays 702 eggs on average. The larvae take humus and fine roots in the interstices of clods or loose topsoil, which is harmless to seedlings. 3. Mongolian elephants are Coleoptera. Two generations occurred in one generation, and adults and larvae were overwintering. In mid-April, the adults were found to be unearthed during the winter, mostly in the morning or in the evening. During the day, they lurked under the clods or at the base seam of the seedlings. From mid-April to mid-May, the young seedling stage was the most serious, and there were more than 50 insects in one small seedling. Adults lay eggs in the topsoil, and new larvae emerge one after another in late May. Adults appear in early September. The newly emerged adult did not emerge from the earth and it was wintered in the original soil nest until April 2 of the second year. Second, 3 kinds of pest control methods 1 In the adult stage can take light trapping. 2 When the density of insect population is large, spray 6000 times liquid of enemy killing, 1000 times of 80% trichlorfon emulsifiable concentrate, or 1500 times of 50% killer pine nut oil. 3 seedlings spread poisonous soil. Use 15 kg of 3% carbofuran granules and 450 kg of fine soil. 4 Fill the roots with 50% phoxim or 80% dichlorvos 2000 times. 5 The upper sets of plastic bags in the roots of the seedlings can not only prevent pests from harming, but also can retain moisture and promote the growth of seedlings. Author unit: Kangping County Forestry Bureau
Take the original herbs, remove impurities, wash water, Run through, cut thin slices, dry. Or use when crushed, Coptis should not over 14.0% of the standard moisture, the total ash content of not more than 5.0%, dilute alcohol extract not less than 15.0%. Berberine hydrochloride is not less than 5.5% berberine, berberine not less than 0.80%, berberine not less than 1.6%, palmatine not less than 1.5%.
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