Dispersal behavior of the predatory mite, Amblyseius swirskii, on greenhouse ornamentals and its impact on thrips control

Dispersal of natural enemies through a crop is a key component of biological control. In this study, dispersal rate and behaviour of Amblyseius swirskii Athias-Henriot (Acari: Phytoseiidae) was investigated in potted greenhouse chrysanthemums in the presence or absence of prey (Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae). Results demonstrate that A. swirskii did not disperse far from the release site. Presence of prey did not influence dispersal, but had an effect on predator survival in one experiment. The impact of the dispersal behaviour of A. swirskii will be discussed in the context of ornamental biological control programs.