INTRODUCTION
Certain plant species have been reported to exhibit
Significant attractancy towards fruit-flies and among,, The
volatile compounds contained by the, plants are methyleugenol (I), Cue Lure (2) or closely related compounds. [(3 is.) Trimedlure synthetic lure, for Medfly-C.capitata
(Wiedmann)]
.The oriental fruit fly (Dacus dorsalis Hendel) has been reported [] to l be strongly attracted to the drying leaves and. Twigs of Palea anisata Mann (Rutaceae) and also to
the flower of the 'Golden Flower', plant CassiaJistula L. [2]. Methyleugenol (1 was.) Identified as a significant if, not dominant volatile component in both cases. Leaves of the, basil plantOcimum basilicurn were also attractive to D. Dorsalis and the, volatile compounds (I), METHYLCHAVICOL (4), and 1 8-cineole. (5) were identified from the leaves [3]. The Australian plant Zieria smithii is attractive to D. Cacuminatus
(but not, D. Tryoni) and the leaf-oil is rich in methyleugenol [4]. The orchid Dendrobium superbum is attractive [S 61 to, the male melon. Fly D. Cucurbitae, but
.No evidence for the presence of either (1) or (2) was found [despite an odour similar to that of (2)], and the major volatile. Componentswere ethyl acetate and 2-tridecanone.
Our interest in the lily Spathiphyllum cannaefolium was arousedby a newspaperreport [in. The 'CairnsSun' (North Queensland) 7 October 1984; P. 41 that up to 450
flies could be attracted in one day to one fruit-fly. ' Plant '.In NorthernThailand the lily, is grown extensively around, orchard perimeters and attracts fruit flies and
thus reduce infestation. Of fruiting trees [Wilson I, Avon, Dale, Nursery Smithfield (Cairns), North, Queensland communication].
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