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The article discusses tunnel trials with numerous tunnels and one bee hive per tunnel as opposed to open field studies with several bee hives standing at and foraging on the same field. It stresses on the importance of the uniformity of the tunnel tents when building tunnels, as only exactly measured plots ensure homogeneous spray area, equal amount of sprayed solution within the replicates and honeybees' exposure to the treated crop and comparability of the data collected.