Acanthoscelides obtectus (Say, 1831) (Coleoptera: Chrysomelidae: Bruchinae) es unescarabajo de distribución cosmopolita que ocasiona graves daños a diversas especies de la familia Fabaceae. Este trabajo es el primer reporte de su infestación en arbustos de Senna multiglandulosa (Jacq.) H.S. Irwin & Barneby, 1982 (Fabaceae) en la zona andina central del Perú. Se describe la morfología de los estados biológicos de A. obtectus y las perforaciones que realizaron en legumbres infestadas colectadas en tres lugares del Valle del Mantaro de enero a diciembre 2018. Se midió la longitud total (L) y ancho (A) de los huevos, larvas, pupas y adultos de A. obtectus, así como el diámetro (D) de las perforaciones en vainas y semilla de S. multiglandulosa. Los resultados mostraron diferencias significativas en los tamaños de cada uno de los estadios (p < 0,001) y sus perforaciones en las legumbres (p < 0,001), afectan especialmente las semillas de S. multiglandulosa, por lo cual se constituye en un problema sanitario muy severo en la planta estudiada. Acanthoscelides obtectus (Say, 1831) (Coleoptera: Chrysomelidae: Bruchinae) is a beetle with a cosmopolitan distribution that causes severe damages to diverse species of the Fabaceae family. This is the first report of its infestation on Senna multiglandulosa (Jacq.) H.S. Irwin & Barneby, 1982 (Fabaceae) bushes in the central Andean region of Peru. The morphology of the biological stages of A. obtectus and the perforations they made on infested legumes collected in three sites of Mantaro Valley from January to December 2018 are described. The total length (L) and width (W) of eggs, larvae, pupae, and adults of A. obtectus and the diameter (D) of the perforations on the pods and seeds of S. multiglandulosa were measured. The results showed significant differences in the size of each stage (p < 0.001) and their perforations on legumes (p < 0.001), affecting mainly the seeds of S. multiglandulosa, constituting a severe health problem for the studied plant.
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