Entomology Branch

Cedar City, GA, United States

Entomology Branch

Cedar City, GA, United States
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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.


PubMed | Univers Est Paulista Julio Of Mesquita Filho, Secretaria de Vigilancia em Saude, University of Valencia, Laboratorio Of Fisiologia E Bioquimica Of Insetos Instituto Oswaldo Cruz and 3 more.
Type: | Journal: Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases | Year: 2015

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.


De Kogel W.J.,Wageningen University | Koschier E.H.,University of Vienna | Broughton S.,Entomology Branch | Castane C.,IRTA - Institute of Agricultural-Alimentary Research and Technology | And 7 more authors.
Bodenkultur | Year: 2015

Thrips are small insects that cause direct damage and some transmit viruses to agricultural and horticultural crops and forest trees. Current thrips management requires a significant input of agrichemicals, which creates risks for workers, consumers and the environment. As well, a number of thrips species are of significant quarantine concern. New thrips management strategies are urgently needed to supplement existing tools such as chemical and biological pesticides. For example, semiochemical-based technologies could serve as additional management tools, since they have proved their efficiency at controlling many large insect pests. However, these technologies have been under-exploited for small insects such as thrips. To address this issue, an international network was initiated in 2012, the focus of this Europe Australasian Thrips Semiochemical Network (EATS) is to develop semiochemical-based tools for management of thrips. The progress made in this field is reported in the following paper.


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.

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