Abstract: The Meloidogyne incognita has become the most important pathogen of theroot-knot nematode disease of sugarcane in Zhanjiang and Panyu ofGuangdong.Second-stage of the species infected the roots of young shoot ofsugarcane.Five or six giant cells formed in the stele.Adjacent cells were stimulatedto divide resulting in forming either big or small root-knots.Root systems ofsugarcane plant infested by the disease were easily decay;stalks were thin and short;the foliages became yellowish in color that resembled the plant with deficient in ap-plied at 4.5kg(ai)/hm2 increased 10.7 percent in yield.