A survey of the mite fauna of Scottish farms

Abstract The mite fauna of 31 Scottish farms was studied during 1971–1972 to determine the species found in grain storage and handling areas, and associated stock rearing facilities. Methods of sampling and preparing mites for identification are described. Tables listing habitats, frequency of occurrence and intensity of infestation are included, with an appendix listing the 70 species, 39 genera, and 22 families found during the survey. The commonest mite species in grain stores were also those most frequently found in the stock rearing areas. Comparisons are made with recent similar surveys on farms and in poultry houses in England and Wales, and on stored grain and grain products in Ireland. The pest potential of Acarus, Tyrophagus and Glycyphagus spp is considered and it is concluded that Acarus farris is a true stored products pest found throughout the storage period. Tyrophagus longior and Glycyphagus destructor , two of the commonest species on farms, showed no adverse effect on the germinative capacity of grain tested. The possibility of biological control of Tyroglyphid mites by two predacious species, Cheyletus eruditus and Androlaelaps casalis is examined and some evidence of successful control is presented.