Abstract
The capture of prey by last instar larvae of the aphidophagous coccinellidHarmonia axyridis Pallas (Col.,Coccinellidae) modified larval movement so that extensive search was replaced by intensive search. The continuous rearing of this species on eggs ofEphestia kühniella Zell. (Lep.,Pyralidae) or on the aphidAcyrthosiphon pisum Harris (Homopt.,Aphidae) led to conditioning. Only larvae that ate the same prey as they were reared on, adopted intensive searching movements after feeding. Using larvae reared on substitute prey in biological control systems may decrease the efficiency of the released predators.
Résumé
Chez les larves de dernier stade de la coccinelleHarmonia axyridis Pallas (Col.,Coccinellidae) l'ingestion d'une proic entraîne une modification du comportement locomoteur: la recherche extensive est remplacée par la recherche intensive. L'élevage permanent de cette espèce sur une proie particulière, les œufs d'Ephestia kühniella Zell. (Lep.,Pyralidae) ou, le puceronAcyrthosiphon pisum Harris (Homop.,Aphidae) aboutit, au travers de l'apprentissage, à un conditionnement trophique. Seules les larves qui reçoivent une proie identique à celle de l'élevage, abandonnent la recherche extensive et adoptent la recherche intensive. L'utilisation en lutte biologique contre les pucerons de larves produites sur la proie de substitution peut se traduire par une diminution de leur efficacité prédatrice.
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Ettifouri, M., Ferran, A. Influence of larval rearing diet on the intensive searching behaviour ofHarmonia axyridis [Col.: Coccinellidae] Larvae. Entomophaga 38, 51–59 (1993). https://doi.org/10.1007/BF02373138
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DOI: https://doi.org/10.1007/BF02373138