Banksia is an Australian plant that undergoes cell death to seal of pathogen due to a response to a fungal pathogen (Puccinia triticina Eriks), causing the plant disease 'rust'. It causes an observable response of yellow patches on the top of the leaf as well as black spots and blotches on the leaf. This is due to a failed physical barrier, thick cuticle and leaf orientation which failed to prevent the replication of the pathogen. The pathogen triggered a rapid active response, which caused the cell death to seal of pathogen, which involves the cells around the pathogen dying, preventing the pathogen from receiving nutrients, leading to pathogen death.