APHID SURVIVAL AT LOW TEMPERATURES
| Autor: | Jean B. Adams |
|---|---|
| Rok vydání: | 1962 |
| Předmět: | |
| Zdroj: | Canadian Journal of Zoology. 40:951-956 |
| ISSN: | 1480-3283 0008-4301 |
| DOI: | 10.1139/z62-084 |
| Popis: | The survival of aphids after different periods of exposure to temperatures of −20° F, 0° F, 10° F, 26° F, and 28° F was examined. None of the nine species, Aulacorthum solani (Kltb.), Myzus ornatus Laing, Macrosiphum euphorbiae (Thos.), Myzus persicae (Sulz.), Aphis gossypii Glover, Rhopalosiphum padi L., Macrosiphum avenae (Fab.), Myzus lythri (Schrank), and Brevicoryne brassicae L., held at −20° or 0°, survived exposures of even 4 hours; at 10°, 1% of only M. ornatus, M. euphorbiae, and M. persicae survived after 4 hours. Two species, M. ornatus and M. euphorbiae, were examined at 26°; at this temperature more than 50% of both species survived for more than 350 hours. At 28°, five species from greenhouse and field collections survived to the 50% level for the following periods: M. ornatus, 400 hours; M. persicae, 600 hours; Aphis nasturtii Kltb., 675 hours; M. euphorbiae, 700 hours; and Nearctaphis bakeri Cowan, 1300 hours. Collections of "conditioned" M. persicae from outdoors showed an increase in resistance to cold with survival at the 50% level rising from about 300 hours to about 700 hours between July and September. However, survival after 1000 hours did not differ significantly. It is concluded that at least M. persicae and N. bakeri have the potential cold resistance to survive New Brunswick winters in the viviparous state. |
| Databáze: | OpenAIRE |
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