some species of nematophagous fungi are being investigated for use in biological pest control. "purpureocillium lilacinum", for example, infests the plant-parasitic "meloidogyne incognita", which attacks the roots of many cultivated plants. trials have provided varying results, with some strains being aggressive and others less pathogenic, and some strains that appeared promising in the lab proved ineffective in the field. "arthrobotrys dactyloides" shows promise at controlling the cosmopolitan plant-parasitic root-knot nematode "meloidogyne javanica".