Eur. J. Entomol. 101 (1): 37-41, 2004 | DOI: 10.14411/eje.2004.009

Predation upon the oblique-banded leafroller, Choristoneura rosaceana (Lepidoptera: Tortricidae), by two aphidophagous coccinellids (Coleoptera: Coccinellidae) in the presence and absence of aphids

Éric LUCAS1, Sophie DEMOUGEOT1, Charles VINCENT2,*, Daniel CODERRE1
1 Département des Sciences Biologiques, Université du Québec a Montréal, C.P. 8888 Succ. Centre-ville, Montréal, QC, Canada H3C3P8; e-mails: lucas.eric@uqam.ca, coderre.d@uqam.ca
2 Horticultural Research and Development Center, Agriculture and Agri-Food Canada, 430, Gouin Blvd., Saint-Jean-sur-Richelieu, QC, Canada J3B 3E6; e-mail: vincentch@agr.gc.ca

Our goal has been to determine the effect of the presence of aphids on voracity (measured as number of prey eaten and biomass consumed) of Coccinella septempunctata L. and Harmonia axyridis Pallas (Coleoptera: Coccinellidae) feeding upon the oblique-banded leafroller, Choristoneura rosaceana (Harris) (Lepidoptera: Tortricidae). For each coccinellid predator, treatments using a single prey species, with either 30 first instar C. rosaceana or 100 third instars Aphis pomi DeGeer (Hemiptera: Aphididae), were compared with two-prey treatments in which the two prey species were present simultaneously. For both predators, the total number of prey killed (total prey species pooled) and the total biomass consumed were significantly higher when both prey were present than in single-prey treatments. The voracity of C. septempunctata on C. rosaceana larvae was not affected by adding A. pomi, whereas that of H. axyridis declined; the voracity of both predators on A. pomi increased when C. rosaceana larvae were added. The preference for the aphids over C. rosaceana was confirmed for both coccinellid species.

Keywords: Harmonia axyridis, Coccinella septempunctata, Choristoneura rosaceana, Aphis pomi, biological control, predation, voracity, feeding preference, Coccinellidae

Received: June 17, 2002; Revised: May 28, 2003; Accepted: October 10, 2003; Published: March 25, 2004  Show citation

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LUCAS, É., DEMOUGEOT, S., VINCENT, C., & CODERRE, D. (2004). Predation upon the oblique-banded leafroller, Choristoneura rosaceana (Lepidoptera: Tortricidae), by two aphidophagous coccinellids (Coleoptera: Coccinellidae) in the presence and absence of aphids. EJE101(1), 37-41. doi: 10.14411/eje.2004.009
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