Watermelons grown in northern Australia may be infested with eggs and larvae of the cucumber fly. Therefore, these watermelons cannot be exported to NZ unless they are treated in some way to ensure that no live stages of this pest are present. This project aimed to determine the host status of watermelons of the varieties Red Tiger, Shadow, Gemini, and Baby-lee for cucumber fly and papaya fruit fly. These varieties were identified as having export potential for NZ by industry representatives.