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samedi 12 août 2017 - Rédaction SNP

 Les californiens n’avaient aucune raison de se disculper d’avoir importé en Tunisie le CRP. Pour autant, devaient-ils charger l’Europe alors même que tout le monde sait que le CRP directement ou indirectement vient d’Égypte.

 

 


The invasion of Tunisia by the red palm weevil, Rhynchophorus ferrugineus Oliver (Coleoptera : Curculionidae) : crossing an ocean or crossing a sea ?
Paul F Rugman-Jones, Saida Kharrat, Mark S Hoddle, Richard Stouthamer

Abstract

The red palm weevil, Rhynchophorus ferrugineus, is a highly invasive, injurious pest of palms, originating from South- and Southeast Asia. Following its accidental introduction into the Middle East, this species rapidly extended its range to include much of the Persian Gulf, Mediterranean Basin, and North Africa. This range expansion has seriously impacted the date palm industries of many countries, and led to the death of thousands of iconic ornamental palms, particularly around the Mediterranean. Rhynchophorus ferrugineus has never been recorded from the USA, but a morphologically indistinguishable congener, R. vulneratus, was detected in California, USA, in 2010 (and later eradicated). In December 2011, despite strict phytosanitary regulations, an invasive population of palm weevils was for the first time detected in ornamental palms in Tunis, Tunisia. The specific identity of the weevil population in Tunisia has not been confirmed, and this has fueled consternation over its potential origin. It has been reported that the Tunis invasion resulted from the illegal importation of infested palms from the USA. However, contradictory claims from government employees, suggest that infested palms were imported from Italy. We compared the mitochondrial haplotypes of specimens collected at multiple sites around Tunis, and compared them to haplotypes from globally distributed invasive and native populations of R. ferrugineus and R. vulneratus. We conclusively show that the Tunisian weevils are R. ferrugineus, refuting the claim that the invasion occurred as a result of importing infested palms from the USA. Moreover, we characterize the Tunisian population as having the same fixed mitochondrial haplotype ubiquitous in invasive populations throughout the neighboring regions, providing support for claims that the invasion of Tunisia by RPW occurred as a result of importing infested palms from Europe.

Key Words : invasive pest ; red palm weevil ; Rhynchophorus vulneratus ; phytosanitary regulation ; mitochondrial DNA ; COI

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