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由线虫为害造成的水稻干尖病又名水稻白尖病。本致病线虫耐寒不耐高温,在干燥的稻种内可存活3年左右。因它以幼虫或成虫潜伏在谷粒的颖壳和米粒间越冬,所以带虫种子是本病的主要初次侵染源。通过灌溉水和土壤传播的可能性较小。稻种内的线虫,在浸种催芽时即开始活动。播种后,大多数线虫游离于水中及土壤内死亡,而少数侵入稻苗或传播为害。稻苗被害后,上部叶片尖端2～4厘米逐渐卷皱,呈白色、灰色或淡褐色的“干尖”,病健部界限明显,继则捻曲、歪扭,“干尖”因风吹或磨擦而折断脱落,常严重影响水稻产量。
Rice dry tip caused by nematode, also known as rice white tip disease. The pathogenic nematode cold hardy high temperature, in dry rice species can survive about 3 years. Because of its larvae or adult lurking in the grain between the shell and rice wintering, so the worm seed is the main primary infection of the disease. It is less likely to spread through irrigation water and soil. Nematodes within the rice species, in the seed soaking germination began activities. After sowing, most nematodes die free of water and soil, while a few invade the rice seedlings or spread. After the rice seedlings were killed, the tip of the upper leaves were gradually creased 2 to 4 centimeters, becoming white, gray or light brown, and the boundary of disease and health was obvious. Or friction and broken off, often seriously affect the yield of rice.