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Cold hardiness of laboratory-maintained and seasonally-collected populations of the black bean aphid, Aphis fabae Scopoli (Hemiptera: Aphididae)

Published online by Cambridge University Press:  10 July 2009

Rose O'Doherty
Rose O'Doherty
Affiliation:
Department of Pure and Applied Zoology, University of Leeds, Leeds, LS2 9JT, UK
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Abstract

The cold hardiness of Aphis fabae Scopoli was assessed by determining the ability of individual aphids to supercool. All stages of A. fabae maintained parthenogenetically at 20°C on broad bean (Vicia faba) were capable of extensive supercooling ability to below −20°C; first- and secondinstar nymphs were the most cold hardy individuals. First instars and adult apterae of A. fabae collected from natural summer populations on broad bean and sugarbeet in England showed levels of supercooling similar to that of laboratory-maintained aphids. Compared to aphids on herbaceous hosts, all those associated with the woody host, spindle (Euonymus europaeus), showed a substantially poorer ability to supercool, often to less than −15°C, both in the autumn (oviparae) and spring (fundatrices and fundatrigeniae). All samples of eggs supercooled to below −30°C, becoming fully acclimatized in mid-winter, and lost supercooling potential prior to hatching in spring. The influence of feeding on woody and herbaceous plants on the cold hardiness of A. fabae was confirmed in a series of host-plant transfer experiments in which aphids that were transferred to bean from spindle acquired good levels of supercooling and then lost over 10°C of supercooling potential when transferred back to spindle. The shift from poor (spindle-associated) to good (bean-associated) supercooling was more difficult to achieve and suggested the presence of a nucleator in the spindle sap.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 76 , Issue 3 , September 1986 , pp. 367 - 374
Copyright
Copyright © Cambridge University Press 1986

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