Dragon fruit (Hylocereus spp.) is a promising tropical fruit which can be cultivated in different tropical and subtropical parts of the world such as Southeast Asia, and Central and South America. The demand for dragon fruit extensively increases and the fruit today can be found on almost all exotic fruit markets around the world. This success can be partly explained by the fruit qualities, e.g. appearance, nutritional values and health benefits, but also by the commercial policies of producing and exporting countries such as Thailand and Vietnam, which are the main producing countries of dragon fruit. Tropical fruit crops in Thailand are steadily becoming an important aspect of agricultural production. The exports of fresh and processed tropical fruits from Thailand have shown upward trends since 1980 (Salakpetch, 2000).