Abstract
From April to October 2010, native predatory mites (Acari: Gamasina) were collected every 10 days from spinach-cultivated soils of 6 greenhouses located in Hokkaido. From the 14 species collected, Ascidae sp.1, Ascidae sp.2, Hypoaspis (Gaeolaelaps) sp., Cycetogamasus diviortus (Athias-Henriot), Parholaspulus alstoni Evans, Macrocheles sp., and Rhodacaridae sp. dominated in frequency of occurrence. In October 2010, 8 predatory mite species were collected from the soils of 5 greenhouses where spinach was not grown; of these species, 5 were different from those collected from spinach fields.
