Issue:ISSN 2095-1353
CN 11-6020/Q
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2012年49 No.6
Extreme low temperature tolerance of Leptocybe invasa
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Key Words： Leptocybe invasa，areas，hosts，supercooling point，freezing point
Abstract： Leptocybe invasa Fisher ＆ La Salle is a new，quarantinable，invasive species． In order to clarify the extremelow temperature tolerance and potential range of this pest we measured the supercooling and freeezing points of all lifestages except the egg． Adult L． invasa live at different latitudes and have varied hosts． The larvae overwinter in threesouthern Chinese provinces from December to March． The relative supercooling and freezing points of three life stages waspupa ＜ larvae ＜ adult． The supercooling and freezing points of pupae were ( － 24. 93 ± 0. 05 )℃ and ( － 22. 81 ±0. 02)℃，respectively，and the supercooling and freezing points of adults were ( － 20. 93 ± 0. 27)℃ and ( － 17. 33 ±0. 17)℃，respectively． Supercooling and freezing points decreased with increasing latitude． The relativesupercooling andfreezing points of L． invasa on different hosts in Hainan Province were Zhan-201 ＜ Eucalyptus exserta ＜ Guanglin nine．Supercooling and freezing points of L． invasa are rising with increasing environmental temperatures． The lowestsupercooling and freezing points of overwintering larvae，( － 25. 44 ± 0. 17)℃ and ( － 24. 04 ± 0. 21)℃，were recordedin Guangzhou city in January when thetemperature was the lowest in four months． The lowest recorded supercooling pointof an individual was － 26. 9℃ ． Our results reveal stronger cold hardiness in the pupa and egg stages than in larvae oradults． Latitude，host and temperature have an appreciable impact on cold hardiness． The results suggest that this pesthas the potential of spreading further north．