Abstract: 【Aim】 Agriphila aeneociliella is a new pest of wheat crops, which survives summer as diapausing larvae making cocoon in soil. This study aims to determine the survivorship of A. aeneociliella in sustained high temperature and extreme high temperature in summer, so to provide a basis for population monitoring and management in autumn. 【Methods】 The diapause and non-diapause larvae of A. aeneociliella were subjected to extreme high temperatures (43, 46, 49, 52 and 55℃ ) for 0.5, 1, 2 and 4 h, and to the common high temperature (35, 37, 39 and 41℃) for 1, 2, 4 and 8 d, respectively. 【Results】 Semi-lethal temperatures of diapause larvae with cocoon of A. aeneociliella were 50.04℃ (95% confidence interval: 49.36-50.47℃) and 48.81℃ (95% confidence interval: 47.74-49.37℃), and those with cocoon removed were 48.20℃ (95% confidence interval: 47.66-48.74℃) and 47.36℃(95% confidence interval: 47.08-48.37℃) when subjected to the extreme high temperature for 2 and 4 h, respectively. The median lethal time of diapause larvae with cocoon was 1.29 h (95% confidence interval: 1.17-1.44 h), and that with cocoon removed was 1.02 h (95% confidence interval: 0.93-1.18 h) when subjected to the extreme high temperature of 52℃. The median lethal time of diapause larvae with cocoon was 3.21 d (95% confidence interval: 2.92-3.52 d) and that without cocoon was 2.66 d (95% confidence interval: 2.33-3.02 d) when subjected to the common high temperature at 41℃. 【Conclusion】A. aeneociliella has a strong tolerance to high temperatures, and cocoon has a protective effect on diapausing larvae. Ploughing and stubble cleaning to make cocoons or larvae exposed to the soil surface after wheat harvesting, which takes advantage of high temperature of soil surface to kill diapause larvae, can be used as an efficient agricultural control measure.

Key words: Agriphila aeneociliella, extreme high temperature, diapause larvae, survival rate, cocoon