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

European Journal of Entomology

Sophie DEMOUGEOT¹  Daniel CODERRE¹  Charles VINCENT²  Éric LUCAS² 

[1] e-mails: [e-mail], [e-mail];Département des Sciences Biologiques, Université du Québec a Montréal, C.P. 8888 Succ. Centre-ville, Montréal, QC, Canada H3C3P8;

关键词: harmonia axyridis;    coccinella septempunctata;    choristoneura rosaceana;    aphis pomi;    biological control;    predation;    voracity;    feeding preference;    coccinellidae;   

DOI  :  10.14411/eje.2004.009

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown