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Dutch elm disease (DED) is caused by the fungal pathogen Ophiostoma novoulmi which is transmitted by the native elm bark beetle, Hylurgopinus rufipes. We have found that four semiochemicals [(-)-P-pinene, (-)-a-cubebene, (+)-spiroaxa-5,7-diene and (+)-&cadinenel from diseased American elms, Ulmus americana, synergistically attract H. rufipes, and that their emission is up-regulated in elm trees inoculated with 0. novo-ulmi. The fungus thus manipulates host trees to enhance their apparency to foraging beetles, a strategy that increases the probability of transportation of the pathogen to new hosts.