Thrips are small, slender insects which measure about 2-3 mm long when mature. On adults, two pairs of narrow wings fringed with long hairs are visible and when at rest, the wings are laid along the back. Their colour depends on the species, but these can range from a pale yellow through to a greyish yellow-brown to black. In order to establish characteristics which distinguish the different species, magnification is required. Recently, new species have been introduced from abroad and can be potentially damaging pests, such as Western....