Since the lifting of import ban of Hawaiian papaya, other fruits such as mango, yellow pitaya, mangosteen and litchi were gradually ban-lifted from various countries in the world and, in most cases, VHT has been carried out successfully without any problem for many years. However, one accident arose in 2002 when live larvae of oriental fruit fly were detected on the treated papaya shipments from the Philippines. Investigations for the cause revealed that the owner of the facilities had neglected manufacturer’s maintenance, frequently repeated repairs on his own and, in the course of 15 years, almost remade his facilities. It s, therefore considered that improper maintenance seriously downgraded the performances of facilities to give rise to cold spots in the treated fruits which, eventually, led to the survival of fruit fly in the export shipment to Japan.