Figure 2.

Cumulative pine weevil mortality (percentage of dead weevils: number of dead pine weevils out of total n = 40) per treatment after Hylobius abietis was exposed to 3 and 7 consecutive days of Bt‐treated food (green and blue bars respectively), 7 subsequent days of non‐Bt treated food (stem pieces of Picea abies) (yellow bars) and an additional 7 days of observation in boxes (i.e. after 3 weeks; grey bars). Treatments are abbreviated as follows: control (C), Bt galleriae formulation (low and high concentration: BL, BH), Bt israelensis (VL, VH), Bt tenebrionis (NL, NH).