Insect Population Parameters of Acanthoscelides obtectus (Say.) in Grains of Five Cultivars of Common Beans (Phaseolus vulgaris L.)

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Acanthoscelides obtectus (Coleoptera, Bruchidae) is a phytophagous insect that feeds on beans (Phaseolus vulgaris L.) during storage, principally in temperate climate regions. For this reason, it is necessary to determine population parameters of this coleopteran that would permit prognosis of populations and identification of resistant beans. Population parameters were estimated with the cohort life table technique, the Logrank test (p≤0.05) and reproductive rates, and confidence intervals with the non-parametric technique Overlapping Intervals (p≤0.09) to compare instantaneous rate of population growth (rm), also called innate increment capacity. These parameters were estimated in the bean cultivars Blanco Tabasco, Flor de Mayo, PintoDurango, Rayado Rojo and Línea Elite No. 4, all resistant to two types of rust caused by Uromyces phaseoli var. typica and U. appendiculatus. Weevil population parameters were higher for adult emergence, mean life expectancy and reproductive rates in the cultivars Rayado Rojo and Línea Elite No. 4.

Jorge Vera-Graziano
Serafín Cruz-Izquierdo