Beauveria cannot and will not grow in people’s houses. Under normal humidity conditions, it will not even germinate unless it is in contact with a bed bug. At very high humidity (>90%), the microscopic spores in the spray residue may germinate, but no visible growth will occur, and the spore will just go on to die because it has no food source to utilize. Typical mold fungi (Aspergillus and Penicillium) have specific enzymes that allow them to break down cellulose and lignin and are adapted to growth in structural environments. You can see these fungi because they grow and produce new spores (the green coloration) using the wood or plasterboard as a food source. Beauveria does not produce these enzymes and cannot grow in these environments.