Cut flowers of oriental lily (Lilium ‘Oriental hybrids’) at the tight bud stage of the commercial harvest standard were harvested, cut into a length of approximate 50cm in the field, transported to our laboratory within 1 d under refrigeration conditions, and then immediately used for fumigation (Brosnan and Sun, 2003). The internal dimension of the refrigerator car was 2.5m (height)×4.2m (length)×2m (width).Before fumigation, these flowers were further sorted for consistent appearance in a cooling room at 5 ◦C, and then sets of 10 stems of flowers were bunched. Three bunches of flowers of the same cultivar were placed in a plastic chamber with about 500 adults of western flower thrips (more than half were females) for 3 h for ovipositing. Flowers infested with insects were mixed with non-insect flowers for treatments. Two cultivars of oriental lily (‘Siberia’ and’ Sorbonne’) were
used in our tests. All chamber loading rates were equal to or less
than 30%. Control bunches were treated in the same way without