Troubleshooting
Chester Blackberry problems — and how to fix them
Chester Blackberry (Rubus fruticosus 'Chester') 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.
Late ripening in cool seasons
As a late variety, 'Chester' can fail to finish fruit in short, cool seasons or shady sites. Plant in the warmest, sunniest spot and against a south-facing wall in marginal areas.
Raspberry beetle
Larvae damage developing drupelets near the stalk. Cultivate the soil beneath plants in winter to expose overwintering larvae and use beetle traps.
Grey mould (botrytis)
Fruit rot in wet late summers. Improve airflow, remove spent fruited canes after picking and clear any mouldy berries quickly.
Cane blight and spur blight
Dark lesions and wilting on canes caused by fungal infection. Cut out and destroy affected canes, sterilise tools and avoid wounding stems.
Prevent chester blackberry problems before they start
Most chester blackberry issues are care-mismatch, not bad luck. Dial in the basics:
Looking for chester blackberry in general rather than its problems? Read the full chester blackberry care guide — light, water, soil and feeding.
Chester Blackberry problems — FAQ
Why is my chester blackberry late ripening in cool seasons?
As a late variety, 'Chester' can fail to finish fruit in short, cool seasons or shady sites. Plant in the warmest, sunniest spot and against a south-facing wall in marginal areas.
Why is my chester blackberry raspberry beetle?
Larvae damage developing drupelets near the stalk. Cultivate the soil beneath plants in winter to expose overwintering larvae and use beetle traps.
Why is my chester blackberry grey mould (botrytis)?
Fruit rot in wet late summers. Improve airflow, remove spent fruited canes after picking and clear any mouldy berries quickly.
Why is my chester blackberry cane blight and spur blight?
Dark lesions and wilting on canes caused by fungal infection. Cut out and destroy affected canes, sterilise tools and avoid wounding stems.