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Mean area debarked (mm2) ± standard error per treatment while Hylobius abietis was cumulatively exposed to (a) 3 days, (b) 5 days and (c) 7 days of Bt‐treated (green bars) and control (water‐treated; grey bars) food (stem pieces of Picea abies) in a choice experiment. Treatments are abbreviated as follows: control and Bt galleriae treated food (B); control and Bt israelensis treated food (V); control and Bt tenebrionis treated food (N).
