Scientific name Schizaphis graminum (Rondani) Homoptera, Polygonaceae. Distributed throughout the country.
Host grasses such as wheat, barley, oats, sorghum, rice, setaria, sedge, etc.
Damage characteristics Wheat bipartite often sucks sap from the front and back sides of the wheat leaf, or leaves both inside and outside the basal leaf sheath, causing the wheat seedlings to dry or fall out of joints. The severe wheat strains cannot head normally, which directly affects the yield. In addition, wheat yellow can also be transmitted. Dwarf disease.
Morphological characteristics Wingless orphan female body length 2.0mm, oval, pale green, dorsal midline dark green, abdominal tube light green, black top. In the chest and abdomen with a short handle. The frontal tumor is higher than the median tumor. Antennae of 6 knots, full-length more than half of the body, surpasses the mid-foot base section, the end section is thick and short, length is 1,6 times the base width. Abdominal tube is cylindrical, tail long conical, length is 1.5 times the base width, there are 5-6 long hair. The winged female is 1.8mm long and has a long oval shape. Live green, back midline dark green. Head, chest black, light belly. The tentacles are black in six total lengths and are more than half in length. The third section of the antenna has 4-10 small round secondary sensory circles, arranged in a row. Forewing midrib two-forked.
Life habits Mai Bibi's habits are similar to those of the Long Tuber. They are born 20 to 30 years old, and the specific algebra varies from place to place. Winter wheat hybrid area and early sowing
The dynamics of winter wheat populations: After the autumn seedlings unearthed, they began to migrate to the wheat fields, and there was a small peak from the 3rd leaf stage to the tillering stage, and they entered the winter in early November with eggs on the wreckage of the winter wheat field. In the middle and early March of the following year, the wintering eggs hatch. After several generations of breeding on winter wheat, some continue to breed with wingless females and some produce winged oysters that breed in winter wheat fields. Some migrated to spring wheat in mid-April. In the first half of May, a large number of breeds emerged as the peak period of damage, and may cause the yellow dwarf epidemic. The rate of development of wheat bifurcation at 10-30 Â°C is positively correlated with temperature. The survival rate below 7 Â°C is low, the fecundity at 22 Â°C is rapid, the growth and development are the fastest at 30 Â°C, and the rapid death occurs at 42 Â°C. Under appropriate conditions, the aphid has strong fertility and a short duration of development. During the jointing and booting stages of wheat, the density of the population rapidly rises, often within 15 to 20 days, and the amount of 100 plants can reach more than 10,000.
The prevention and treatment method is the same as that of wheat straw.
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