The scientific name Chilo infuscatellus (Snellen) belongs to the order Lepidoptera, Polygonaceae. Alias ​​sugar cane two points, two points, millet borer and so on. Distribution northeast, north China, expansion, Shaanxi, Ningxia, Henan, Shandong, Anhui, Taiwan, Fujian, Guangdong, Guangxi.
The host said that the millet ash in the north was mainly affected by millet, corn, sorghum, millet, glutinous rice and so on. In the south, it was said that sugarcane is mainly responsible for sugarcane.
The trait is characterized by larvae grazing stalks such as millet, forming seedlings at the seedling stage, and being susceptible to wind failure during the heading stage to form leeches and pods.
Morphological characteristics Adult body length 8.5-10mm, wingspan 18-25mm, male body pale yellow-brown, frontal circle does not protrude to the front, no single eye, the lower lip must be light brown, chest dark yellow; forearm shallow yellow brown mixed Black-brown scales, with 1 small black spot on the top of the middle room and 1 in the middle room, sometimes only 1 spot, 7 black spots on the outer edge of the line, and a grayish white, light brown outer edge. Female moths are lighter in color and there are no black spots in the forewings. Egg length 0.8mm, flat oval, the surface of reticular pattern. Early white, grayish black before hatching. The last-instar larvae are 15–23mm in length with a reddish-brown or dark-brown head, yellowish-white chest, five violet-brown longitudinal lines on the back of the body, and a slight midline. The length of the dragonfly is 12-14mm. There are brown protrusions around the 5-7th section of the abdomen. After section 7, it is thin and flat. The primordial milky white turns dark brown before feathering.
Living habits 2-3 years old in the north of the Yangtze River, the old mature larvae in the valley or in the grass, corn borer and corn stalks in winter. The larvae in Inner Mongolia, Northeast China, and Northwest China larvae in late May, and emerged in early June. In general, the mid-June period was the period of adult emergence, followed by the prosperous period of spawning. The first-generation larvae died in mid-late June. From mid-August to early September, the second-generation larvae enter the period of damage. Overwintering larvae in North China and Anhui Huaibei phlegm in late April-early May temperatures around 18°C; adults prosperous in late May, prosperous in late May and early June, and late in May-mid-June. The larvae are at the height of their damage, and in the middle and late July they are the second-generation larvae. Generations of spawning of the third generation are in late July. The larvae are infested from mid-August to early September, and the mature larvae are wintering. The South is 4 - 5 generations old, Hainan 5 - 6 generations, overlapping generations, the main damage to sugar cane, the specific situation, see two points of sugarcane. Adults grow into night and evening activities. After copulation, eggs are laid on the back of the leaves. Each female lays about 200 eggs. The egg period lasts two to five days. The newly hatched larvae climb to the base of the stem and drill holes from the leaf sheath into the stem. Injury, the completion of the above process takes 1-3 days. A total of 5 instar larvae, in addition to longer duration of overwintering larvae, generally 19-28 days. The young larvae like to cluster and begin to disperse after 3rd instar. Injures in the stem for about 15 days. After 4 years of age, it began to invade the plant. Each larvae often infested 2-3 strains. After aging, the larvae were in the stems. The extent of the occurrence of this worm depends on the base number and climatic conditions for overwintering. The overwintering larvae suffer from heavy rainfall, high humidity, phlegm, feathering, and spawning. For example, in Xinxiang, Henan, the rainfall is more than 40mm in May, and more than 8 rainfalls may occur. In Liaocheng, Shandong Province, there are about 10 live insects in winter, 20–25°C in mid-May and early June, 70% relative humidity, and more than 25 mm of rainfall. Relative humidity less than 50% occurs lighter. In the second generation, when the relative humidity was higher than 70% in mid-July, heavy loads occurred.
Prevention methods (1) Forecasting forecasts can generally forecast or estimate the occurrence degree of a generation of millet ash according to the amount of rainfall and the number of rainfall in May. (2) Promote insect-resistant varieties. (3) When autumn ploughing, pick up net glutinous rice dumplings, oysters, etc., and concentrate them deeply or burn them. The cereal straw must be crushed or piled up before the end of April to reduce the source of overwintering insects. Sowing period can be adjusted according to local conditions, trying to avoid seedling period adult emergence fecundity, can reduce the victim. (4) It has been reported that when there are five egg masses per 500 grain seedlings in Gutian, or when there are 5 seedlings in the dry seedlings, they should immediately use 50% 1605 EC 100ml, add a small amount of water and mix well with 20kg fine soil. The ridge is withdrawn from the heart or leaves of the valley. Can also be used 1.5% methyl parathion powder 2kg, mixed soil 20kg made of toxic soil, withdraw in the valley of the seedlings, the formation of medicine, the effect is also good.
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