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线形动物包括线虫、蛔虫和蛲虫,是一类性喜潮湿的动物,种类万千,但习性和特征各异。生活在土壤和植物内的线虫个体很小,要用显微镜才能看清楚。一般100立方厘米土壤内有,4,000～5,000条线虫或更多,它们的数量所在位置依环境而异,特别是随气候和土壤条件不同而变化,植物的密度也有一定关系。按线虫营养需要可分为腐生、捕食(捕食其他线虫)和植食类(即为害植物的线虫)。不同种类线虫为害寄主植物的症状不同,与寄主的生育期和种类有关。最主要的为害症状有:
Linear animals include nematodes, roundworms and pinworms, are a class of animals that are hygroscopic and have a myriad of species but different habits and characteristics. Nematodes living in soil and plants are small and can only be seen with a microscope. Generally, there are 4,000-5,000 nematodes or more in 100 cm3 of soil. The quantity of these nematodes varies with the environment, especially with the change of climate and soil conditions. The density of plants also has a certain relationship. According to nematode nutrition needs can be divided into saprophytic, prey (predation of other nematodes) and plant-eating (ie, nematodes harmful plants). Different types of nematodes harm the symptoms of different host plants, and the host of the growth period and type. The main symptoms of harm are: