Journal Article

Trophic interactions between two herbivorous insects, <i>Galerucella calmariensis</i> and <i>Myzus lythri,</i> feeding on purple loosestrife, <i>Lythrum salicaria,</i> and two insect predators, <i>Harmonia axyridis</i> and <i>Chrysoperla carnea</i>

Bethzayda Matos and John J. Obrycki

in Journal of Insect Science

Volume 7, issue 1
Published online May 2007 | e-ISSN: 1536-2442 | DOI: http://dx.doi.org/10.1673/031.007.3001

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The effects of two herbivorous insects, Galerucella calmariensis Duftschmid and Myzus lythri L. (Coleoptera: Chrysomelidae), feeding on purple loosestrife, Lythrum salicaria L. (Myrtiflorae: Lythraceae), were measured in the presence of two insect predators, Harmonia axyridis Pallas (Coleoptera: Coccinellidae) and Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae). A greenhouse cage experiment examined the direct effects of these predators on these herbivores, and indirect effects of predation on aboveground biomass, defoliation, number of leaves, and internode length. Eight treatment combinations with G. calmariensis, M. lythri, H. axyridis and C. carnea were applied to caged L. salicaria. The experiment ended when G. calmariensis adults were observed, 11 to 13 days after release of first instar G. calmariensis. G. calmariensis larvae alone removed significant amounts of leaf tissue and reduced the number of L. salicaria leaves. Predators did not reduce levels of defoliation by G. calmariensis. C. carnea had no effect on G. calmariensis survival, but H. axyridis reduced G. calmariensis survival in the presence of M. lythri. Both predators reduced the survival of M. lythri. This short duration greenhouse study did not demonstrate that predator-prey interactions altered herbivore effects on L. salicaria.

Keywords: trophic cascade; biological control of weeds; predator-prey interactions

Journal Article.  4133 words. 

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