Hydrolyzes intracellular trehalose to glucose (By similarity). Plays a role in pathogenicity, specifically in proliferation of invasive hyphae in rice blast disease (PubMed:12514128). alpha,alpha-trehalose + H2O = alpha-D-glucose + beta-D-glucose Carbohydrate degradation. During sporulation, plant infection and in response to hyperosmotic stress. Belongs to the glycosyl hydrolase 37 family.