31 Luck,J Hollaway,G Freeman,A Powell,K Chakraborty,S 2008 Examining the effects of elevated CO2 on key pathogens of wheat 9th International Congress of Plant Pathology Torino, Italy 106 Journal of Plant Pathology 90 (S2) 24/08/2009 <p>Climate change is increasingly recognised as a major threat to natural and agricultural systems, yet the potential effects of pathogens on these changing systems are not clearly understood. The Department of Primary Industries Victoria and The University of Melbourne have established a Free-Air CO2 Enrichment (FACE) research facility at Horsham, Victoria, to study the effects of elevated CO2 on wheat production in Australia. This facility provides a unique opportunity to study possible changes in host pathogen-interactions and the effectiveness of partial resistance genes in the presence of elevated CO2 in the field. Worldwide, studies on host-pathogen interaction in the presence of elevated CO2 have been limited. In this work, we studied the influence of CO2 on the interaction between wheat and <em>Puccinia striiformis (</em>wheat stripe rust), <em>Fusarium seudograminearum </em>(crown rot) and Barley yellow dwarf virus. The major aim of this project was to understand the effects of projected CO2 concentrations (550 ppm) under field conditions on key disease threats to wheat. Preliminary analysis of the first season&rsquo;s data suggested limited effects on fecundity and disease progress of stripe rust and severity of crown rot, however further analysis is required. A background infection of BYDV made it difficult to interpret any CO2 effect on the virus but visual observations showed little difference between the CO2 treatments. Results from the statistical analysis of the experiments will be presented.</p> http://www.sipav.org/main/jpp/volumes/0808/ICPP_2008.pdf