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United States Department of Agriculture

Agricultural Research Service

Title: INSECT HERBIVORY STIMULATES ALLELOPATHIC EXUDATION BY AN INVASIVE PLANT AND THE SUPPRESSION OF NATIVES)

Author
item Thelen, Giles
item Vivanco, Jorge
item Newingham, Beth
item Good, William
item Bais, Harsh
item Landres, Peter
item Caesar, Anthony
item Callaway, Ragan

Submitted to: Ecological Applications
Publication Type: Peer reviewed journal
Publication Acceptance Date: 9/15/2004
Publication Date: 10/1/2004
Citation: Thelen, G.C., Vivanco, J.M., Newingham, B., Good, W., Bais, H.P., Landres, P., Caesar, A.J., Callaway, R.M. 2004. Insect herbivory stimulates allelopathic exudation by an invasive plant and the suppression of natives. Ecological Applications. 14:209-217

Interpretive Summary: Exotic invasive plants are often subjected to attack from imported insects as a method of biological control. A fundamental, but rarely explicitly tested assumption of biological control is that damaged plants are less fit and compete poorly. In contrast, we find that one of the most destructive invasive plants in North America, Centaurea maculosa, exudes far higher amounts of ()-catechin, an allelopathic chemical known to have deleterious effects on native plants, when attacked by larvae of two different root boring biocontrol insects. We also demonstrate that C. maculosa plants experimentally attacked by these biocontrols exhibit more intense negative effects on natives.

Technical Abstract: Exotic invasive plants are often subjected to attack from imported insects as a method of biological control. A fundamental, but rarely explicitly tested assumption of biological control is that damaged plants are less fit and compete poorly. In contrast, we find that one of the most destructive invasive plants in North America, Centaurea maculosa, exudes far higher amounts of ()-catechin, an allelopathic chemical known to have deleterious effects on native plants, when attacked by larvae of two different root boring biocontrol insects. We also demonstrate that C. maculosa plants experimentally attacked by these biocontrols exhibit more intense negative effects on natives.

Last Modified: 8/24/2016
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