myrtyle family

• Myrtaceae Family (e.g. Eucalyptus trees)
• Myrtle rust (fungal)
• Hypersensitive response: Infected plant cells undergo programmed cell death (necrosis) at the infection site, creating small, dark lesions with a pale halo. This localised cell suicide isolates the fungus and limits access to nutrients.
• • Eucalyptus species produce essential oils in sub-dermal secretory cavities. These oils have antifungal properties that can inhibit spore germination and fungal growth.
• • Leaf cuticle and bark act as primary physical barriers against fungal entry.
• • leaves vertically hanging
• • releases hormones to stop spread of pathogen
• • Heavy infection disrupts photosynthesis by damaging chloroplast-rich tissues. This weakens the plant and reduces its ability to sustain immune responses.
• • Most species in the Myrtaceae family have low natural resistance, allowing the fungus to reproduce and spread easily, especially under humid conditions.