Barley exposed to aerial allelopathy from thistles ( Cirsium spp.) becomes less acceptable to aphids.Published in:Ecological Entomology, 2004, v. 29, n. 2, p. 188, doi. 10.1111/j.0307-6946.2004.00582.xBy:Glinwood, Robert;Ninkovic, Velemir;Pettersson, Jan;Elham Ahmed, JanPublication type:Article