APHIS gossypii

Scientific name Diuraphisnoxia (Mordvilko) Homoptera, Aphididae. Synonym Brachycolusnoxius. Alias Russian wheat aphid. Distributed in *. In addition, the Liaohe River, the Yellow River. The Huaihe River and Haihe River basins are suitable for the growth of the insect. Foreign countries are mainly distributed in Ukraine, Central Asia, North Africa, Eastern Europe, Nepal, South Africa, Mexico, the United States and Canada. It is a major wheat pest in the world. It is the object of domestic quarantine.

There are more than 70 kinds of Gramineae crops and weeds, such as host, barley, rye, oat, rye, brome and so on. Sometimes it harms rice.

When the damage is characterized by damage to wheat, the flag leaves are rolled longitudinally and cannot heading normally. Production will be reduced by 30% to 60%.

The morphological characteristics of wingless parthenogenetic aphids are long 1.59mm, wide 0.6mm and light green. The middle chest and abdomen bifurcate without handle until the arms are disconnected. The length of antennae was 0.74 mm, and the proportion of length of 6 segments was 35, 30, 100, 62, 58, 46 + 91. The beak reaches the middle basal ganglia, and the length of the last segment is 0.74 times longer than that of the posterior financial segment 2. The hair sequence of tarsus l is 3, 3, 3, and 3. The ventral canal is not as long as the base width. The dorsal segment of the eighth ventral segment has an upper tail in the center, which is 0.55 times longer than that of the tail. There are 5 or 6 hairs in the tail, 5 short hairs in the upper tail, 9 hairs in the caudal plate and 20 hairs in the reproductive plate. The winged parthenogenetic aphids are 2.46mm in length and 0.82mm in width. The length of antennae is 0.74 mm in length, and the proportion of length of 6 segments is 23, 12, 100, 100, 51, 53, 43 and 92, there are 6 circular secondary sensory organs in 3, and 1 or 2 in 4.

The life habit is 11 generations a year, living in the whole cycle of life in the cold wheat area. Female aphids and male aphids are produced in late autumn and early winter. After mating, the eggs are laid on wheat or Gramineae weeds, and the eggs hatch in the next spring. Parthenogenetic on the above hosts for three generations, the first and second generations are wingless, and the third and fourth generations are winged, migrating outward or harming the wheat harvest. Incomplete parthenogenesis in warm areas. The natural enemies are fig aphid wasp, heteropod aphid wasp, wide sheath aphid cocoon wasp, aphid gall midge, ladybug and so on.

Control methods (1) selecting varieties with low susceptibility to insects, such as two-grain wheat, Mg4537, Mg7458, Mg8786, Mg8256, etc., can reduce the damage. (2) planting wheat varieties with high insect susceptibility, such as Maodou, Hongfor, Mo rice ear, 7432-15-0-21, Goumaobai and so on, they can attract a large number of insect sources and then be eliminated centrally, which can not only reduce pesticide application, save manpower and material resources, but also protect natural enemies and carry out natural control. (3) when planting good local varieties, the above susceptible varieties were interplanted to eliminate the wheat aphid in the trapping zone. (4) it is forbidden to transfer Gramineae seedlings from the place where they occurred. The seedlings of exotic grasses should pay attention to inspection and disinfection. (5) spray 10% of lice aphid (imidacloprid or once) if necessary.