Lipase which is essential for lysis of subvacuolar cytoplasm to vacuole targeted bodies and intravacuolar autophagic bodies (By similarity). Involved in the lysis of intravacuolar multivesicular body (MVB) vesicles (By similarity). The intravacuolar membrane disintegration by ATG15 is critical to life span extension (By similarity). Autophagy is required for proper vegetative growth, asexual/sexual reproduction, and full virulence (PubMed:28894236). Autophagy is particularly involved in the biosynthesis of deoxynivalenol (DON), an important virulence determinant (PubMed:28894236). a triacylglycerol + H2O = a diacylglycerol + a fatty acid + H(+) Binds to both phosphatidylinositol (PI) and phosphatidylinositol 3,5-bisphosphate (PIP2) (By similarity). From ER, targeted to vacuolar lumen at the MVB vesicles via the Golgi and the prevacuolar compartment (PVC). Significantly decreases the radial growth of colonies under nutrient-rich conditions (PubMed:28894236). Strongly reduces conidiation (PubMed:28894236). Reduces strongly the production of deoxynivalenol (DON), an important virulence determinant (PubMed:28894236). Belongs to the AB hydrolase superfamily. Lipase family.