This Quickscan was prompted by the finding of the spider mite Stigmaeopsis longus. Thus far, the organism was only known to be present in Japan. The species causes damage to leaves of bamboo which can make plants unmarketable and less popular as garden plants. Damage is comparable to damage caused by the bamboo mites, S. celarius and S. nanjingensis that have been introduced into the EU before. These species are absent from northern parts of the EU. S. longus is more adapted to coolers areas and is expected to establish in more northern areas than S. celarius and S. nanjingensis. Its introduction is, therefore, expected to increase the impact by bamboo mites especially in the north of the EU.