Troubleshooting
Riberry problems — and how to fix them
Riberry (Syzygium luehmannii) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Myrtle rust (Austropuccinia psidii)
The most serious disease threat to lilly pillies. Bright yellow-orange pustules on new growth cause leaf distortion and can defoliate young plants. Remove affected growth promptly, apply a registered fungicide, and avoid overhead watering. Choose rust-resistant cultivars where available.
Psyllid leaf pitting
Pimple psyllids cause raised pits on new leaves and shoot distortion, reducing ornamental appeal. Treat with horticultural oil and a systemic insecticide at the first sign of activity on young growth. Cultivars selected for psyllid resistance are preferable for hedge use.
Iron/manganese chlorosis
Yellow leaves with green veins on new growth indicate nutrient deficiency in alkaline soils or after excess watering. Acidify the soil with sulphur, apply chelated iron and manganese, and ensure the pH remains below 6.5.
Prevent riberry problems before they start
Most riberry issues are care-mismatch, not bad luck. Dial in the basics:
Riberry problems — FAQ
Why is my riberry myrtle rust (austropuccinia psidii)?
The most serious disease threat to lilly pillies. Bright yellow-orange pustules on new growth cause leaf distortion and can defoliate young plants. Remove affected growth promptly, apply a registered fungicide, and avoid overhead watering. Choose rust-resistant cultivars where available.
Why is my riberry psyllid leaf pitting?
Pimple psyllids cause raised pits on new leaves and shoot distortion, reducing ornamental appeal. Treat with horticultural oil and a systemic insecticide at the first sign of activity on young growth. Cultivars selected for psyllid resistance are preferable for hedge use.
Why is my riberry iron/manganese chlorosis?
Yellow leaves with green veins on new growth indicate nutrient deficiency in alkaline soils or after excess watering. Acidify the soil with sulphur, apply chelated iron and manganese, and ensure the pH remains below 6.5.