Bactrocera cucurbitae (Diptera, Tephritidae) is one of the major pest for cucurbits (cucumber, zucchini, melon, etc.) and can cause nearly 90% production losses on Cucurbitaceae crops in La Réunion.The objective of the present study was to improve our knowledge of olfactory stimuli used by females of B. cucurbitae to locate cucurbit host plants. We firstly compared different laboratory devices (a wind tunnel, olfactometers with one or four arms and small test cages) for assessing fly responses to different host plants. In the wind tunnel, females showed no orientated response in the presence of host odours. By contrast, positive response in small test cages and olfactometers was recorded. This allowed us to measure the relative attractiveness of the odours of different wild and cultivated cucurbitaceae for B. cucurbitae females. In parallel, the volatile composition of the odours of fruit and flowers of these different cucurbits was characterised using headspace-solid phase microextraction (SPME)/gas chromatography-mass spectrometry (CG-MS). This study should allow us to assess the host preferences of the Melon fly and eventually identify some powerful kairomonal attractants for this pest.