ハスモンヨトウの耐寒性と越冬に関する研究 : II.虫体凍結温度と低温致死温度

概要

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Cold-hardiness of S. litura larvae and pupae surviving in the late autumn or in the early winter was examined. The mean supercooling point of the larvae was about -8℃. However, -5℃ was a critical point for the larvae : the percentage of larvae frozen to death by exposure to -5℃ for 12 hr, 24 hr and 48 hr were 0,24 and 100 respectively. All larvae were susceptible to freezing and died soon. No dead larvae were observedwwhen subjected to 0℃ even for 48 hr. Supercooling points of pupae were at around -9℃, for one group and at around -16℃, for another group. The former was younger pupae ; the latter was older ones. Over 80% of pupae did not freeze when subjected to -5℃ for 48 hr, but died while being reared at under 20℃. When the larvae were placed into wet conditions such as moist soil, freezing occurred at a higher temperature level than the mean supercooling point. This was due to ice inoculation.
日本応用動物昆虫学会の論文
1991-02-25