Imagine a tree species so devastated by disease that it’s been dubbed the 'zombie tree'—alive, yet unable to grow or reproduce. This isn’t the plot of a sci-fi thriller; it’s the grim reality facing the Rhodamnia zombi, a rainforest tree identified in 2020 just as it began its slide toward extinction. But here’s where it gets even more alarming: this isn’t an isolated case. The culprit, a fungal disease called myrtle rust, has already pushed 17 species to the brink of extinction, and scientists are in a desperate race to save them. Can we intervene in time, or will these species vanish within a generation?
Discovered in the lush rainforests of Queensland’s Burnett region, the Rhodamnia zombi is a small to medium-sized tree with distinctive large, dark green leaves, shaggy bark, and hairy white flowers. But its beauty belies a grim truth: myrtle rust infects its new growth, preventing shoots from maturing and halting its ability to thrive. Field surveys revealed a haunting scene—some trees already dead, and the survivors barren, producing neither flowers nor fruit. 'If you can’t grow or reproduce, you’re pretty doomed,' says Professor Rod Fensham, a botanist at the University of Queensland. And this is the part most people miss: myrtle rust, first detected in Australia in 2010 after arriving from overseas, has spread like wildfire through native forests, leaving devastation in its wake.
But here’s where it gets controversial: While many native plants have shown tolerance to myrtle rust, a small group, including the Rhodamnia zombi, has proven tragically susceptible. Why? Scientists believe the answer lies in evolution—or rather, the lack of it. Without the ability to produce seeds, these trees are stuck in a genetic dead-end. 'For something that’s taken millions of years to evolve to vanish within a generation—it’s profound,' Professor Fensham reflects. 'It stinks, but it’s also extraordinary to witness.'
The only hope for survival? Resistance. Some close relatives of the Rhodamnia zombi show natural tolerance to myrtle rust, sparking hope that resistance genes may be 'lurking somewhere in the genome.' But there’s a catch: this evolutionary process can’t happen in the wild because the trees are no longer producing seeds. Enter a bold solution: scientists are partnering with specialist nurseries to grow clean cuttings in protected conditions, aiming to keep the plants disease-free long enough for them to flower and set seed. 'It’s a rare chance to watch evolution in real time,' Professor Fensham notes.
On Queensland’s Sunshine Coast, groups like Barung Landcare are on the front lines of this fight. Horticulturist Alexandra Hayes-Hatten and conservation trainee Milo Wakeman-Bateman meticulously collect cuttings from wild populations, propagate them in controlled environments, and monitor them for signs of infection. 'It’s a fine line to play,' says Hayes-Hatten. 'But there are a few that are doing pretty well.' For her, the work is both daunting and inspiring. 'Learning about something that might just go extinct in the blink of an eye is quite scary,' she admits. 'But we’ve got the people and the resources, so we might as well step up and do something.'
Nursery specialists in Lismore and Townsville have joined the effort, and the long-term goal is ambitious: to identify resistant individuals and reintroduce them to forests where the species once thrived. 'These trees need time and space without being constantly exposed to myrtle rust to express any resistance,' Professor Fensham explains. Left unchecked, the Rhodamnia zombi will remain what scientists have grimly named it—the living dead.
Here’s the thought-provoking question: As we witness this battle against extinction, are we doing enough to protect biodiversity? Or are we standing by as species vanish, one by one? Share your thoughts in the comments—this conversation is far from over.
