Hydrolyzes intracellular trehalose to glucose (Probable). The disaccharide trehalose serves as a storage carbohydrate that is mobilized during conidial germination (PubMed:10320571). Regulates the level of trehalose as a protectant for cell integrity during heat stress (PubMed:10320571). alpha,alpha-trehalose + H2O = alpha-D-glucose + beta-D-glucose Activated by calcium. Carbohydrate degradation. Expressed during spore germination and growth. Induced during recovery from thermal stress. Abolishes trehalose degradation during conidial germination and delays germ tube formation (PubMed:10320571). Resistance to thermal stress (PubMed:10320571). Belongs to the glycosyl hydrolase 37 family.