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Insect herbivory stimulates allelopathic exudation by an invasive plant and the suppression of natives
- 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 and a parasitic fungus. We also demonstrate that C. maculosa plants experimentally attacked by one of these biocontrols exhibit more intense negative effects on natives.
Thelen, Giles C. , Vivanco, Jorge M. , Newingham, Beth , Good, William , Bais, Harsh P. , Landres, Peter , Caesar, Anthony , Callaway, Ragan M.
Trichoplusia ni , Cyphocleonus achates , phytophagous insects , biological control agents , invasive species , Centaurea stoebe subsp. micranthos , noxious weeds , allelopathy , root exudates , catechin , plant competition , phytotoxicity , ecological invasion , Thanatephorus cucumeris , plant pathogenic fungi
- Includes references
- Ecology letters 2005 Feb., v. 8, no. 2
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.