How to control rice chironomid

Rice chironomid, commonly known as red worm and red nematode, uses larvae to damage young roots and buds of rice, causes floating seedlings, and feeds on ungerminated seed embryos and endosperms, so that seeds can not germinate, resulting in serious damage to rice seedling fields and direct seeding fields.

The adult is a small moth with wings shorter than the body. When it is at rest, the forefoot is raised and swayed up and down. The larva is red or yellowish, and there is a limb-like protuberance on the ventral side of the chest. Three generations of 2Mel occur every year, and the first generation harms rice. Overwintering with kidneys and adults in weeds. The adults appeared in the first ten days of May and laid eggs in late May. The eggs hatched into larvae and caused damage in 4 days. In 1999, due to the low temperature in the early stage, the slow seedling stage was prolonged after seedling planting, resulting in a great occurrence of rice shaking in Changtu County. Tongjiangkou Township, Taiping Township, Changtuzhan Township, Baoli Town and other 7 townships suffered rice in varying degrees, covering an area of 1100 mu. The lightly injured seedlings grew slowly, the white roots were few and short, 10% of the leaves withered, 20% of the leaves withered, and all the heavy ones withered and died.

Prevention and control methods: 1. Agricultural control: draining and drying the field for 3 days, which can restrain the damage of rice chironomid. Changing water to dry cultivation can reduce the damage of rice chironomid. 2. Chemical control: ① uses 90% crystal trichlorfon, 10Mel 15g, water 10Mel 15kg, and sprays in rice bushes when the water depth is about 4cm. After ② drained the field water, stopped for a day and hung a small bag containing trichlorfon at the inlet for irrigation. when the irrigation water was about 3 mi 4 cm deep, stop irrigation and block the inlet and kill the larvae 12 hours later. ③ uses 5% methyl mixed with phosphorus granules of 1 kg per mu and 15 kg of soil (sand) to spread, which can also control other pests with good results.