Costa J.,Instituto Oswaldo Cruz |
Bargues M.D.,University of Valencia |
Neiva V.L.,Instituto Oswaldo Cruz |
Lawrence G.G.,Entomology Branch |
And 9 more authors.
Infection, Genetics and Evolution | Year: 2016
Triatoma brasiliensis macromelasoma occurs in Pernambuco state, Brazil, which is situated between the distribution areas of Triatoma brasiliensis brasiliensis (north) and Triatoma juazeirensis (south). T. b. macromelasoma displays greater variations in its chromatic phenotype than either T. b. brasiliensis or T. juazeirensis, and patterns reminiscent of one or the other. Experimental crosses from each of these members of the T. brasiliensis species complex generated fertile offspring suggesting that viable hybrids could be present in nature, despite their significant genetic distances. Considering the geographical position of occurrence of the T. b. macromelasoma (in Pernambuco) it was proposed to be an area capable of supporting natural hybridization between T. b. brasiliensis and T. juazeirensis. Since phenotypic variability is expected, this study investigated the existence of intermediate chromatic phenotypes for T. b. macromelasoma in various locations in areas between the T. b. brasiliensis and T. juazeirensis occurrences. Thirteen different color patterns were for the first time characterized and nine of those displayed intermediate phenotypes. Molecular analysis performed using ribosomal DNA intergenic region, grouped all within the T. brasiliensis complex. The intermediate chromatic phenotypes, molecular analysis and experimental crosses all support the distinction of a zone of hybridization that gave rise to the T. b. macromelasoma through homoploidal evolution. © 2015 Elsevier B.V.
Broughton S.,Entomology Branch |
Cousins D.A.,Entomology Branch |
Rahman T.,Entomology Branch
Crop Protection | Year: 2015
Western flower thrips, Frankliniella occidentalis (Pergande) is an important insect pest of greenhouse roses. Trials were carried out in glasshouse grown roses with the commercially available thrips lures ThripLine ams (male sex aggregation pheromone) and Lurem-TR (kairomone) with yellow sticky traps to evaluate their efficacy as part of a monitoring and mass trapping strategy against F.occidentalis. In all trials, 1.2-4 times more F.occidentalis were caught on traps baited with pheromones compared to unbaited traps. More females were caught in both pheromone baited and unbaited traps than males. Lurem-TR was equivalent to ThripLine ams, except in one of the five trials where more F.occidentalis were caught. Use of commercially produced lures with sticky traps for mass trapping thrips pests in glasshouse grown crops as part of the integrated management are discussed. © 2014.