African rice gall mosquito, introduction of rice gall mosquito

I can't find out the characteristics of the species, but the control method should be the same as that of rice gall mosquitoes: 1. Seed treatment: every 2 catties of dry rice seed amount after rice seed germination and whitening, spread out after 3-4 hours after planting with 10% Ruijinte 10ml of water and 15-20ml seed dressing, which can prevent and control rice gall mosquitoes, drill worms and other insect pests at the seedling stage.

If it cannot be soaked in seeds, then imidacloprid + Ruijin special spray can be used for control.

Orseoia oryzae (wood-mason), a species of insect in the family Gallidae. Also known as rice gall fly. In the larval stage, the sap of the rice growth point is sucked, so that the rice cannot be headed.

Now it is distributed in Guangdong, Guangxi, Fujian, Yunnan, Guizhou, Hainan, Jiangxi, Hunan and Taiwan. According to the observation of Guangchang County, Jiangxi Province, after the insect entered Guangchang County from Shicheng County, it still spread northward at a speed of 10-20km every year. Host rice, Lee's He, etc.

Guangdong Lianshan is born in 6-7 generations, Conghua, Guangxi, Jiangxi, Yunnan and Fujian are 7-8 generations, Guangdong Foshan and Zhongshan are 8-9 generations, and Hainan is 12-13 generations. The larvae overwinter on weeds such as wild grasses, regenerated rice, and Lee's grass at the edge of fields and ditches. In the area of 7-8 generations per year, the adults of the overwintering generation appeared in late March to early April, and the adults flew to the nearby early rice after emergence, and the generations of the insect overlapped from the second generation, and it was difficult to distinguish the number of generations, but the peak period of the adults of each generation was more obvious.

Generally, the number of generations is small, and the number increases after three generations, and from July to October, the seedlings and Honda of medium rice, single season late rice, and double season late rice are very likely to be seriously harmed. The adult worm mates on the night of emergence, the male worm mates many times, the female worm only 1 time, the eggs are scattered on the young leaves near the water surface, each female lays 100-150 eggs, the female worm has phototaxis, so the peak day of the insect trap lamp means the peak day of egg laying in the field. The newly hatched larvae move down by the moist dew on the leaves, invade from the leaf sheath space or the edge of the leaf tongue, and begin to damage the growth point, after the growth point is damaged, the heart leaf stops growing, and the leaf sheath elongates into a tube, that is, the "standard onion" appears, and the larvae in the tube have pupated.

Before emergence, the head of the pupae body is upward, and the pupa rises to the top of the onion tube, and the top is broken through with the forehead, leaving a white pupal shell at the exit. The insect likes humidity and is not tolerant to drought, the temperature is 25-29, the relative humidity is higher than 80%, and the rain is conducive to its occurrence. In terms of production, the cultivation system is complex, and the occurrence of rice gall mosquitoes is serious in the single and double cropping rice mixed planting areas.

Natural predators include spiders, mites, ants, walking beetles, frogs, yellow-stemmed black bees, etc.