Determination of the exposure surface area per bee for each active substance.

S.D.: Standard Deviation (n = 3).g a.s./ha: gram of active substance per hectare.ng a.s./ha: nanogram of active substance per hectare.ng a.s./bee: nanogram of active substance per bee.aThe application rate was corrected with the measured concentration (Table 3) and the experimental control deposit.bThis corresponds to the concentration of active substances found in the bees frozen just after contamination.cThe exposure surface area is the ratio between the residues (ng a.s./bee) and the corrected application rate (ng a.s./cm2).For each treatment, the bees from the 6 replicates were counted, pooled, and weighed; the mean bee weight was determined by dividing the weight of bees by the actual number of bees.Determination of the exposure surface area per bee for each active substance.