Two species of thrips are commonly found on protected crops: Western Flower Thrips (WFT), (Frankliniella occidentalis) and Onion or Tobacco Thrips (Thrips tabaci). Larvae and adults pierce the leaf surface and suck out cell contents causing extensive 'silvering'. WFT can also transmit many viruses to crops.
Other species of thrips are also being found, particularly on specimen plants. There is a pheromone for monitoring of Western Flower Thrips.