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ABSTRACT: Rice weevil, Sitophilus oryzae Lin. (Coleoptera: Curculionidae) is economically significant and known as a ubiquitous pest in Bangladesh as well as throughout the world. In this study, the infestation rate by this pest was assessed throughout the year on twelve common indigenous cereal grains and pulses, namely boiled and nonboiled rice, wheat, barley, maize, felon, pea, grass pea, lentil, chickpea, black gram and mung bean. There were significant differences in the infestation rate among the months and in the susceptibility among grains over the year. The highest percentage of weight loss over the year was found in chickpea (84.56%) and the lowest percentage of weight loss was found in black gram (7.09%). The chronological position of the experimental grains according to their percentages of weight loss was chickpea > wheat > barley > maize > nonboiled rice > pea > boiled rice > grass pea > lentil ≥ mung bean > felon > black gram. The highest infestation occurs at the temperature range of 32-35o C and during the month of April-June.
Keywords: Sitophilus oryzae, infestation, stored grains, cereals, pulses
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