Publisher Summary Recognition of eriophyoid mites as the pests of various foods, sylvan, turf, and ornamental plants has been steadily increasing. Identification of acaricidal activity, the stages of the mite affected, and the mode of action studies are all essential steps in the development of new acaricides that are effective against eriophyoids. Slide dip method has been successfully used for Tetranychus spp., where a piece of double-sided Scotch tape is pressed onto a glass slide. Adult spider mites are then individually attached dorsal side down to the tape in replicated series of 10 or 20 per slide. This procedure has been attempted using P.oleivora and A. pelekassi adults in the laboratory. Excessively high mortality resulted within 24 hours, despite the fact that the slides were held in Petri dishes directly above water saturated cotton pads. Effective bioassay testing methods for eriophyoid mite species are limited. Improvement in the understanding of eriophyoid mite biologies, including the identification of their narrow range of environmental requirements, refinement of rearing methodologies, and development of accurate bioassay techniques, are all essential components in optimizing effective chemical control strategies of these mites.