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Titre :
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Arthropod Predators of the Pea Aphid, Acyrthosiphon pisum Harr (Hom, Aphididae) in Peas (Pisum sativum L), Clover (Trifolium pratense L) and Alfalfa (Medicago sativa L)
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Auteurs :
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B. Ekbom
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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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469-476
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Langues:
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= Anglais
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Mots-clés:
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Predateur
;
Inventaire faunistique
;
Dynamique des populations
;
Temperature
;
Sol
;
Acyrthosiphon pisum
;
Aphididae
;
Pisum sativum
;
Trifolium pratense
;
Medicago sativa
;
Leguminosae
;
Coccinellidae
;
Carabidae
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Résumé :
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Arthropod predators of the pea aphid (Acyrtbosiphon pisum Harr.) were collected using pitfall traps in peas (Pisum sativum L.), clover (Trifolium pratense L.) and alfalfa (Medicago sativa L.). Aphid densities were monitored using a vacuum suction sampler. Gut dissections were performed on Coccinella 7-punctata L., Pterostichus melanarius Ill., P. cupreus L. and Bembidion lampros Hbst. to see if they had eaten pea aphids. When aphid numbers were high, 50-80% of C. 7-punctata had eaten pea aphids. Few of the carabids ate pea aphids in the field. There was no correlation between numbers of predators caught and numbers of aphids at peak in any system. Carabids were more common in peas while spiders and staphylinids were more common in clover and alfalfa. Colder weather in 1991 affected both aphid and predator abundance. The importance of synchrony in time and space for the predator-prey relationship are discussed.
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Source :
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Journal of Applied Entomology - Zeitschrift Fur Angewandte Entomologie - 0931-2048, vol. 117, n° 5
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