Thrips setosus (Thysanoptera: Thripidae), the Japanese flower thrips, in cultivation of Hydrangea in the Netherlands

摘要

Thrips setosus Moulton, the Japanese flower thrips, has been found for the first time in the Netherlands. On September 30 2014, 22 females and 5 larvae of this species were detected on Hydrangea in a nursery at Kudelstaart. Until then, T. setosus hadonly been known from Japan and South Korea, where it is a polyphagous minor pest and with no known association with Hydrangea. Remarkably, interceptions in the international trade of plant products of this opportunistic species are very scarce, and thisthrips has not been recorded as an invasive species. A survey carried out showed its presence in several Hydrangea nurseries in the Netherlands. However, the origin of the populations and the year of introduction into the country could not be established. Based on a short risk analysis it has been decided not to focus on elimination of the species, but to inform national and international organizations involved in plant protection about its occurrence. Details about its detection and identification, andthe results of the survey, are presented.