Behavior of Phytoseiulus persimilis towards mint plants in an open space. (a) Schematic drawing of experimental setup for the assay. (b) A pair of candy mint or spearmint plantlets was placed at diagonal positions at the corners, and another pair of odor-source plants was placed at the other corners, on a square board at the same distance from the predator-release point. The odor sources used were: mint plantlets; covered mint plantlets; and potted, undamaged (UD), slightly damaged (SD), or highly damaged (HD) Phaseolus vulgaris plants. Bars represent the overall percentages of predatory mites choosing either of the odor sources. The numbers in the bars indicate the numbers of predatory mite females that made choices. The figures in parentheses represent the numbers of predators that did not choose either odor source (‘no choice’ subjects). A replicated G-test was conducted to evaluate the significance of attraction in each experiment (***P < 0.001; **0.001 ≤ P < 0.01; ns, P > 0.05).