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为害甘薯的马铃薯腐烂线虫（Ｄｉｔｙｌｅｎｃｈｕｓｄｅｓｔｒｕｃｔｏｒ）在土壤中以幼虫和成虫越冬，以幼虫为主。其中，７０％虫体的肠区部位出现类脂质体。质体呈圆形至椭圆形，无颗粒状物，每一虫体内常有５～６个质体，多者达１２～１５个。这种线虫的口针和背食道腺管清楚，但食道腺体部位结构模糊。低温试验结果表明，－５℃至－１５℃即可导致虫体产生类脂质体，而干燥和缺乏营养处理都不能引起虫体出现这一现象。将有类脂质体的线虫接种到甘薯感病品种薯块，２２℃，３０天后，虫体内的类脂液泡全部消失。不同地理位置、不同环境条件的甘薯茎线虫病病原线虫耐盐性有差异。盐滩附近病薯中的线虫耐盐性明显高于内陆地区线虫，在３％ＮａＣｌ溶液中，死亡率只有２１％。酸碱梯度试验证实，这种线虫存活的最适ｐＨ为６．２
Ditylenchus destructor, which harms sweet potatoes, overwinters larvae and adults in the soil, mainly larvae. Among them, 70% of the body parts of intestinal worms appear liposomes. Plastids were round to oval, no particulate matter, each insect body often 5 to 6 plastids, more than 12 to 15. The nematode stoma and back gut ducts clear, but the parts of the esophageal gland fuzzy structure. Low-temperature test results show that -5 ℃ to -15 ℃ can cause the body to produce liposome-like bodies, and dry and lack of nutrition treatment can not cause parasites to appear this phenomenon. Will have liposome-like nematodes inoculated sweet potato susceptible varieties of potato, 22 ℃, 30 days, the parasite vacuoles all disappear. Different geographical locations, different environmental conditions Sweetpotato stem nematodes pathogenic nematode salt tolerance differences. The salt tolerance of the nematode in the diseased tubers near the salt flats was significantly higher than that in the inland nematodes. In the 3% NaCl solution, the mortality rate was only 21%. Acid-base gradient test confirmed that the optimum pH of this nematode survival is 6.2