The increase of mortality of 3-d-old thrips eggs from 3.12% with 0 d treatments to 10.59% with 3 d non-PH3 treatments, indicated long duration cold treatment could lead to higher mortality of eggs. PH3 fumigation treatments could achieve 100% mortality at 1.66mgL−1 PH3 and 12% CO2 for 16 h, 2.29mgL−1 PH3 for 2 d, and 1.83mgL−1 PH3 for 3 d at 5 ◦C. The average concentrations for PH3 fumigation treatments at 1.66mgL−1 PH3 and 12% CO2 for 16 h were 2.19 and 1.47mgL−1 at the start and end of treatments for PH3, 15.11% and 15.49% for CO2, and 17.63% and 17.21% for oxygen, and treatments at 2.29mgL−1 PH3 for 2 d were 3.15 and 2.06mgL−1 for PH3, and treatments at 1.83mgL−1 PH3 for 3 d were 2.42 and 1.59mgL−1 for PH3. PH3 concentrations and durations led to different phytotoxicity levels with the two cultivars (Table 3). Fumigation treatments at 1.83mgL−1 PH3 for 3 d at 5 ◦C had significant negative effects on postharvest quality of ‘Siberia’ and ‘Sorbonne’ lilies.Damageindices of the two cultivars were above 4.0 and flowers were not saleable. There were no significant differences for vase life and damage index of the two cultivars between control and treatments at 1.66mgL−1 PH3 and 12% CO2 for 16 h, and 2.29mgL−1 PH3 for 2 d.