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<p>The Andean weevil is an economically important insect that causes severe damage to potato crops in high Andean regions. This pest comprises three species (i.e., <i>Premnotrypes latithorax</i>, <i>P. suturicallus</i>, <i>P. vorax</i>) and although <i>P. vorax</i> was extensively reported in the Amazonas region, the lack of information on this insect hinders the understanding of their population dynamics. In this context, the Andean weevil was firstly identified as <i>P. vorax.</i> Then, the structure and genetic diversity of Andean weevil populations in the Amazonas region were evaluated. The cytochrome oxidase I (COI) gene was amplified from 75 individuals of <i>P. vorax</i> from the main potato-producing Amazonas regions (i.e., Jalca Grande, Lámud, Levanto, Leymebamba, Luya, and San Isidro del Maino). The phylogenetic analyses in the Andean weevil revealed a single cluster with short branches and no subclustering. Populations showed high levels of haplotypic diversity (Hd = 0.95423), high nucleotide diversity (Pi = 0.00651), significant intraspecific genetic variation (ca. 2.8%), and low genetic connectivity (F<sub>ST</sub> = 0.33463). Overall, these results collectively support a scenario of ongoing gene flow and rapid population expansion driven by climatic factors, potentially facilitated by historical tuber seed introductions. This study contributes to a better understanding of the genetic structure and population dynamics of the Andean weevil <i>P. vorax</i> and will enable the adoption of appropriate control strategies against insects pest populations in the Amazonas region.</p>

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High Diversity and Genetic Variability of Andean Weevil Populations (Premnotrypes vorax, Curculionidae) from the Amazonas Region on the Basis of Mitochondrial DNA Data

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Evelyn V. Portocarrero,
  • Martha S. Calderon,
  • Danilo E. Bustamante

摘要

The Andean weevil is an economically important insect that causes severe damage to potato crops in high Andean regions. This pest comprises three species (i.e., Premnotrypes latithorax, P. suturicallus, P. vorax) and although P. vorax was extensively reported in the Amazonas region, the lack of information on this insect hinders the understanding of their population dynamics. In this context, the Andean weevil was firstly identified as P. vorax. Then, the structure and genetic diversity of Andean weevil populations in the Amazonas region were evaluated. The cytochrome oxidase I (COI) gene was amplified from 75 individuals of P. vorax from the main potato-producing Amazonas regions (i.e., Jalca Grande, Lámud, Levanto, Leymebamba, Luya, and San Isidro del Maino). The phylogenetic analyses in the Andean weevil revealed a single cluster with short branches and no subclustering. Populations showed high levels of haplotypic diversity (Hd = 0.95423), high nucleotide diversity (Pi = 0.00651), significant intraspecific genetic variation (ca. 2.8%), and low genetic connectivity (FST = 0.33463). Overall, these results collectively support a scenario of ongoing gene flow and rapid population expansion driven by climatic factors, potentially facilitated by historical tuber seed introductions. This study contributes to a better understanding of the genetic structure and population dynamics of the Andean weevil P. vorax and will enable the adoption of appropriate control strategies against insects pest populations in the Amazonas region.