Secreted effector that interacts with and inhibits host apoplastic pathogenesis-related papain-like cysteine proteases (Probable). Inhibition of host proteases by a pathogen extracellular protease inhibitor forms a specific type of defense-counterdefense mechanism between plants and microbial pathogens (Probable). Localizes to host apoplast where it targets defense proteases for inhibition. Expressed during infection of host plant and non-sporulating growth, upon nitrogen starvation, in mating culture, in mycelium as well as in ungerminated sporangia. Belongs to the cystatin family.