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Extensive settlement of the invasive MEAM1 population of Bemisia tabaci (Hemiptera: Aleyrodidae) in the Caribbean and rare detection of indigenous populations

Muñiz Y., Granier M., Caruth C., Umaharan P., Marchal C., Pavis C., Wicker E., Martínez Y., Peterschmitt M.. 2011. Environmental Entomology, 40 (5) : p. 989-998.

Bemisia tabaci populations belonging to Middle East-Asia Minor one (MEAM1) and Mediterranean (MED) groups (formerly biotype B and Q, respectively) have spread throughout the world. Although the introduction of MEAM1 is documented from several Caribbean islands, it is generally not known whether MED has also been introduced; whether indigenous populations have survived; and if in the afÞrmative, to which group(s) they belonged. Whiteßies were collected from seven islands on various plant species. The prevalence of MEAM1 and non-MEAM1 individuals was assessed using a microsatellite approach validated with sequences of the mitochondrial cytochrome oxidase I (mtCOI) gene. Of the 262 samples tested, 247 exhibited the MEAM1 pattern, whereas none showed the MED pattern. The mtCOI gene was partially sequenced from a sample of individuals exhibiting MEAM1 (n _ 15) and non-MEAM1 patterns (n _ 8) and compared with type sequences. The 15 individuals exhibiting the MEAM1 pattern were conÞrmed to belong to MEAM1. Of the eight individuals representative of the sixnon-MEAM1patterns, two belonged to the indigenousNewWorld (NW) group of B. tabaci (NW), one belonged to a distinct species of Bemisia, and Þve belonged to MEAM1. One individual belonging to NW exhibited 99.9% nucleotide identity with a NWindividual from Puerto Rico. The other was identiÞed as the most divergent individual of the North and Central American genetic cluster.Weconclude that a highly homogenousMEAM1population has extensively settled in the Caribbean and that heterogeneous NW populations were still detectable although severely displaced. (Résumé d'auteur)

Mots-clés : plante de culture; plante ornementale; mauvaise herbe; bemisia tabaci; cuba; caraïbes; martinique; trinité-et-tobago; guadeloupe; république dominicaine

Thématique : Ravageurs des plantes

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