Troubleshooting
Loganberry problems — and how to fix them
Loganberry (Rubus × loganobaccus) 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.
Raspberry beetle
Larvae tunnel into ripening berries, browning the stalk end. Use pheromone traps and cultivate beneath plants in winter to expose pupae.
Grey mould (botrytis)
Fruit and cane rot in wet weather over its long harvest. Train canes openly, remove fruited canes after picking and clear mouldy berries promptly.
Crumbly or seedy fruit
Often from drought, poor pollination in cold spells, or virus. Keep well watered and replace virus-affected plants with healthy certified stock.
Cane spot and spur blight
Purple lesions on canes weaken growth. Cut out and destroy infected canes and avoid overhead watering to limit fungal spread.
Prevent loganberry problems before they start
Most loganberry issues are care-mismatch, not bad luck. Dial in the basics:
Looking for loganberry in general rather than its problems? Read the full loganberry care guide — light, water, soil and feeding.
Loganberry problems — FAQ
Why is my loganberry raspberry beetle?
Larvae tunnel into ripening berries, browning the stalk end. Use pheromone traps and cultivate beneath plants in winter to expose pupae.
Why is my loganberry grey mould (botrytis)?
Fruit and cane rot in wet weather over its long harvest. Train canes openly, remove fruited canes after picking and clear mouldy berries promptly.
Why is my loganberry crumbly or seedy fruit?
Often from drought, poor pollination in cold spells, or virus. Keep well watered and replace virus-affected plants with healthy certified stock.
Why is my loganberry cane spot and spur blight?
Purple lesions on canes weaken growth. Cut out and destroy infected canes and avoid overhead watering to limit fungal spread.