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28 August 2023 Effect of Chilling on the Spring Emergence of Overwintering Eurytoma maslovskii (Eurytomidae: Hymenoptera)
Hai Nam Nguyen, Ki-Jeong Hong
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Abstract

This study investigated the effect of chilling temperature and duration on diapause termination in Eurytoma maslovskii, a major apricot pest in Korea and China. The experimental insects were sampled in mid-autumn. Overwintering larvae were subjected to a temperature range at –16, –4, 2, 9, 13 °C for 12 wk (a temperature of 19 °C was used for nonchilled control), and then exposed to cold temperature (2 °C) for different durations (from 1 to 16, 19, and 22 wk) at different times (20 September and 30 November) to determine adult emergence, prolonged larval diapause, and development rate postchilling. The results demonstrated a strong association between chilling temperature and duration with the emergence of E. maslovskii. It was observed that diapause may be terminated after at least 6 wk in the cold. However, the rate only reached a higher significance after 10 wk or longer duration of chilling. The optimal chilling temperature ranged from 2 to 9 °C. Late autumn chilling (mid-September) did not differ from winter chilling (late November). The postdiapause development rate of E. maslovskii was determined to be affected by the chilling duration and could be described by a 3-parameter probability density Weibull function. These results suggest that winter conditions play a crucial role in the phenology of E. maslovskii in spring.

Graphical Abstract

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Hai Nam Nguyen and Ki-Jeong Hong "Effect of Chilling on the Spring Emergence of Overwintering Eurytoma maslovskii (Eurytomidae: Hymenoptera)," Environmental Entomology 52(5), 863-869, (28 August 2023). https://doi.org/10.1093/ee/nvad087
Received: 22 June 2023; Accepted: 17 August 2023; Published: 28 August 2023
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KEYWORDS
duration
emergence
low temperature
overwintering
prolonged diapause
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