Lettuce seedlings treated with extracts from Purple Coneflower, Echinacea purpurea
(Images from a project by Colby Genrich '00')

Allelopathy Papers

Belz, Regina G. and Karl Hurle 2004. A Novel Laboratory Screening Bioassy for Crop Seedling Allelopathy. J. Chem. Ecol. 30 (1): 175-198.

Butcko, Victoria M., and Richard J. Jensen. 2002. Evidence of Tissue-specific Allelopathic Activity in Euthamia graminifolia and Solidago canadensis (Asteraceae). Am. Mdl. Nat. 148 (2): 253-262.

Viles, A.L., R.N. Reese. 1996. Allelopathic potential of Echinacea angustifolia D.C. Environ. Exp. Bot. 36 (1): 39-41.