Samuel Musyoka Mbaka, Sasha Vasconcelos, Mohammad Hosein Rezai, Miriam Frida Karlsson, Mattias Jonsson
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For both species, LTime<jats:sub>50</jats:sub> (the number of days until 50% of the mites died) was longer for fed than for unfed mites. The lethal temperature of <jats:italic>A. limonicus</jats:italic> (the temperature at which 100% mortality was reached) was −17.75°C, whereas most <jats:italic>I. degenerans</jats:italic> died at −8.5°C. LTemp<jats:sub>50</jats:sub> (the temperature at which 50% of the mites died) was lower for <jats:italic>A. limonicus</jats:italic> (−9.8°C) than for <jats:italic>I. degenerans</jats:italic> (−0.1°C). Collectively, these findings suggest that <jats:italic>I. degenerans</jats:italic> is unlikely to establish in Sweden but that <jats:italic>A. limonicus</jats:italic> is more cold tolerant. 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引用次数: 0
摘要
了解非本地生物防治制剂的耐寒性对于避免在其原生地以外的新温带地区永久性地建立这些制剂至关重要。我们在实验室研究了捕食螨(Amblydromalus limonicus 和 Iphiseius degenerans)的耐寒性,以评估它们在北欧(尤其是瑞典)定居的可能性。I. degenerans的致死时间(达到100%死亡率的天数)从5°C到0°C急剧下降,在-5°C时几乎为零。A.limonicus的致死时间在5°C和0°C之间没有差异,但在-5°C时有所缩短。对这两种螨虫而言,喂食的螨虫的致死时间(LTime50)(50%的螨虫死亡前的天数)比未喂食的螨虫长。A. limonicus的致死温度(达到100%死亡率的温度)为-17.75°C,而大多数I. degenerans在-8.5°C时死亡。LTemp50(50% 的螨虫死亡时的温度)对 A. limonicus 而言(-9.8°C)低于对 I. degenerans 而言(-0.1°C)。总之,这些发现表明,I. degenerans不太可能在瑞典立足,但A. limonicus更耐寒。这凸显了在瑞典放归A. limonicus的风险,因为人们担心它可能会在瑞典立足。
Cold tolerance of biological control agents Amblydromalus limonicus and Iphiseius degenerans
Knowledge about cold tolerance of non‐native biological control agents is critical to avoid permanently establishing them in new temperate areas outside of their native range. The cold tolerance of the predatory mites, Amblydromalus limonicus and Iphiseius degenerans, was investigated in the laboratory to assess their establishment potential in northern Europe, particularly Sweden. The lethal time of I. degenerans (the number of days until 100% mortality was reached) declined steeply from 5°C to 0°C and was almost zero at −5°C. The lethal time of A. limonicus did not differ between 5°C and 0°C, but was reduced at −5°C. For both species, LTime50 (the number of days until 50% of the mites died) was longer for fed than for unfed mites. The lethal temperature of A. limonicus (the temperature at which 100% mortality was reached) was −17.75°C, whereas most I. degenerans died at −8.5°C. LTemp50 (the temperature at which 50% of the mites died) was lower for A. limonicus (−9.8°C) than for I. degenerans (−0.1°C). Collectively, these findings suggest that I. degenerans is unlikely to establish in Sweden but that A. limonicus is more cold tolerant. This highlights the risk associated with releasing A. limonicus in Sweden due to concerns about potential establishment.
期刊介绍:
The Journal of Applied Entomology publishes original articles on current research in applied entomology, including mites and spiders in terrestrial ecosystems.
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