Figure 13.

(A) Individual plants of Xanthorrheoa australis (austral grass tree), a highly suscpetible native Australian species, infected by Phytophthora cinnamomi within a dry sclerophyll eucalypt forest at Anglesea, Victoria, Australia. Note the dead and dying plants that have brown, collapsed leaves compared with the healthy green and erect leaves of plants which are yet to be killed. These individual plants range in age from approximately 20 years (the smallest in the centre) to around 70 years (green individual on the right of the image). (B) Advancing disease front caused by invasion by P. cinnamomi in Xanthorrhoea australis‐dominated understorey in eucalyptus open forest at Wilsons Promontory, Victoria, Australia. The disease has moved from the foregound of the picture, where all susceptible vegetation including X. australis has been killed, and its progress can be seen as a line of dead and dying X. australis (brown collapsed plants) at the disease margin. Healthy green plants behind them will soon be killed. Loss of the major understorey components, as in the forground, results in complete structural change and loss of all susceptible species.