Required for cytoplasm to vacuole transport (Cvt), pexophagy and mitophagy (By similarity). Also involved in endoplasmic reticulum-specific autophagic process and is essential for the survival of cells subjected to severe ER stress (By similarity). Functions in protein retrieval from the endocytic pathway. Required for proper sorting of the v-SNARE protein SNC1 (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). Forms a complex with SNX4/ATG24 and ATG17 (By similarity). The PX domain binds phosphatidylinositol 3-phosphate which is necessary for peripheral membrane localization of ATG20 to the perivacuolar punctate structures (By similarity). Significantly decreases the radial growth of colonies under nutrient-rich conditions (PubMed:28894236). Strongly reduces conidiation (PubMed:28894236). Causes only mild infection in point-inoculated spikelets of flowering wheat heads and impairs the spreading to nearby spikelets (PubMed:28894236). Reduces strongly the production of deoxynivalenol (DON), an important virulence determinant (PubMed:28894236). Belongs to the sorting nexin family.