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Percentage repellency (PR) of the essential oil from Acorus calamus rhizomes and its constituents against Tribolium castaneum at 2 h after exposurea. aMeans in the same column followed by the same letters do not differ significantly (P > 0.05) in ANOVA and Tukey's tests. PR was subjected to an arcsine square-root transformation before ANOVA and Tukey's tests. bPositive control
