FIGURE 1.

The rearing unit used for predator colonies consisted of (a) a plastic tray filled with soapy water, (b) a plastic float, where (c) infested bean leaves with Two‐spotted spider mites (Tetranychus urticae) were placed as a food source for the predators covered by (d) an upside‐down plastic aquarium with (e) a piece of fine‐meshed flexible gauze hanging from its ceiling. The gauze allowed the predators to disperse from the prey patch and subsequently return without drowning, in this way reducing the selection against mites with higher dispersal. Figure modified from Pels and Sabelis (1999)