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Titre :
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Effects of Extended and Repeated Exposures to Low Temperature on Mortality of the Peach-Potato Aphid Myzus Persicae
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Auteurs :
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G. Howling ;
J. Bale ;
R. Harrington
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Type de document :
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article/chapitre/communication
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Année de publication :
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1994
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Format :
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361-366
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Langues:
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= Anglais
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Mots-clés:
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Aphid
;
Winter Survival
;
Cold Hardiness
;
Repeat Cooling
;
Cycling Temperatures
;
Temperature
;
Adulte
;
Stade larvaire
;
Survie
;
Myzus persicae
;
Aphididae
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Résumé :
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1. The survival of adult and first-instar Myzus persicae reared at 20-degrees-C and 10-degrees-C was investigated after brief (1 min) exposure in the absence of plant material to temperatures between -5-degrees-C and -25-degrees-C, and extended exposures on plants of 1-10 days at a constant 5-degrees-C, 3-degrees-C and -5-degrees-C and a 24 h cycling regime between 5-degrees-C (18 h) and -5-degrees-C (6 h). 2. Life stage, rearing temperature, period of exposure and temperature regime all had a significant effect on the ability of aphids to survive cold. The effects of life stage and rearing temperature were most noticeable following exposure to cycling temperatures and extended exposures at -5-degrees-C, and least apparent after 1 min exposures at lower sub-zero temperatures. 3. Mortality following exposure to temperatures cycling between -5-degrees-C and 5-degrees-C was greater than that at 3-degrees-C (the mean of the cycling temperatures) and less than at a constant -5-degrees-C, suggesting that when temperatures fluctuate by a few degrees around 0-degrees-C the minimum temperature may affect survival to a greater extent than the mean. 4. These results suggest that an overwintering population of acclimated M. persicae would persist without significant mortality after a period of 7-10 days with -5-degrees-C frosts each night.
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Source :
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Ecological Entomology - 0307-6946, vol. 19, n° 4
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