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Response Index (RI) of S. granarius adults to odours of wheat grains (200 g) alone (black bars) or in the presence of ascending doses of hop EO and its main compounds in two-choice bioassays. For each set of experiments, values with the same letter are not significantly different (p < 0.05, Duncan’s MRT test); asterisks indicate significant differences between the number of insects in the treatment and the control (* p < 0.05, ** p < 0.01; Student’s t-test).
