Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Bactrocera dorsalis, an invasive fruit fly species in Mauritius.

Abstract

The Oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae) is a highly polyphagous fruit fly species and key pest of fruits in regions of the world where it has established. B. dorsalis was first detected in Mauritius in 1996 and then declared eradicated in 1999. A second interception was made in 2013 and it was eradicated. The insect was recorded for a third time in 2015 and since then, it has spread to the whole island. Sample of both wild and cultivated fruits were collected from January 2016 to February 2020 to determine the infestation indices for the different fruit fly species. Fruits were collected across the island from 63 plant species representing 28 families. The fruits were weighed and incubated in the laboratory to determine the infestation levels. Eight fruit fly species namely: B. dorsalis, Bactrocera zonata (Saunders), Ceratitis capitata (Wiedemann), Ceratitis quilicii De Meyer, Mwatawala et Virgilio, Dacus ciliatus Loew, Neoceratitis cyanescens Bezzi, Zeugodacus cucurbitae (Coquillett) and Caropmyia vesuviana Costa were reared from the collected fruits. Results showed that B. dorsalis displaced B. zonata, C. quilicii and C. capitata in mango Mangifera indica L., carambola Averrhoa carambola L., guava Psidium guajava L. and Indian almond Terminalia catappa L. among other fruits with the exception of plant species from the family Cucurbitaceae.