How to kill rice dry-tip nematode

After the rice dry-tip nematode erodes rice, it will make the plant leaf tip form a unique white tip, and then necrosis. the invasion of this pest has brought serious economic losses to farmers. How does the rice stem tip bug spread? How do I kill him?

I. how does the rice stem tip worm spread?

Rice stem-tip nematode overwinters as adults and larvae lurking in the glume and between grains, so the infected seeds are the main source of primary infection of the disease. Nematodes can not survive for a long time in water and soil, and there is less transmission in irrigation water and soil.

When the seeds were soaked to promote germination, the nematodes in the seeds began to active. after sowing the diseased seeds, most of the nematodes dissociated in the water and soil, but most of the nematodes died, and a few nematodes encountered buds and seedlings, invaded from the gaps in the coleoptile and leaf sheath, hidden in the leaf sheath, punctured the tissue sap with oral needles, and lived parasitic life outside the camp. With the growth of rice, the nematode gradually moved upwards, and the number of nematodes also increased. Before the early booting stage, the more in the leaf sheath of the upper segments of the plant, the more nematodes. When the young spike was formed, it invaded the panicle and concentrated in the inside and outside of the spikelet shell. The nematodes in the diseased grain are mostly concentrated in the full grain, accounting for about 83% of the total number of worms, while only 12% of the blighted grain accounts for 17%. The female can reproduce 1-2 generations during the growth period of rice.

2. How to kill rice dry-tip nematode

1. Select disease-free seeds, strengthen quarantine, and strictly prohibit the transfer of seeds from disease areas.

2. Establish the disease-free seed field and choose the disease-free seed.

3. The rice seeds were pre-soaked in cold water for 24 hours, then moved to 45-47 ℃ warm water for 5 minutes, then moved to 52-54 ℃ warm water for 10 minutes, then immediately cooled, germinated and sowed.

4. Soak the rice seeds with 550x solution, 6kg of rice seeds for 48 hours, or soak the seeds with 1000 times solution of 50% fenitrothion emulsion for 24-48 hours, or soak the seeds with 18% Shachongshuang solution for 20 hours, remove and rinse and sprout. It can also soak the seeds with 10% soaking seed Ling EC5000 doubling solution for 120h, then sow the seeds without cleaning, and can also treat the disease of evil seedlings. Soak the seeds with 0.5% hydrochloric acid solution for 72 hours, then rinse the seeds with clean water for 5 times. Soak the seeds of 50kg seeds in 500x solution, soak the seeds for 24 hours, then rinse with water.

5. In the process of soaking seeds with Candida albicans and soaking seeds, the light should be avoided and should be stirred frequently. Because of the high temperature in the south, the time of seed soaking can be shortened appropriately.

6. 250 grams of 10 grams of phosphorus granules per mu and 10 kilograms of fine soil mixed with 10 kilograms of fine soil were applied once at the seedling stage of 2-3 leaves.

Rice dry-tip nematode needs to be controlled in time at the early stage to strangle the pest at the early stage.