Species of the family Phytoseiidae (Acari: Mesostigmata) inhabit a wide range herbs, shrubs, and trees. Horse chestnut, Aesculus hippocastanum, is an important ornamental tree in Europe and, addition to its importance for pollinators, it can serve as host plant these predatory mites. Little is, however, known about factors affecting spatiotemporal variability density phytoseiids on A. hippocast...