Troubleshooting
Opal Plum problems — and how to fix them
Opal Plum (Prunus domestica 'Opal') 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.
Brown rot
Densely set early fruit is prone to Monilinia rot in wet summers; remove infected and mummified fruit promptly and improve airflow.
Aphids
Mealy plum aphid and leaf-curling aphid distort spring foliage and excrete sticky honeydew; tolerate light attacks for ladybirds, or spray with soft soap.
Silver leaf
Enters fresh pruning cuts and silvers foliage; prune only in mid-summer and seal nothing — keep cuts clean and small.
Fruit splitting
Heavy rain after dry spells splits the thin-skinned fruit; consistent watering and mulch reduce the swing in soil moisture.
Prevent opal plum problems before they start
Most opal plum issues are care-mismatch, not bad luck. Dial in the basics:
Looking for opal plum in general rather than its problems? Read the full opal plum care guide — light, water, soil and feeding.
Opal Plum problems — FAQ
Why is my opal plum brown rot?
Densely set early fruit is prone to Monilinia rot in wet summers; remove infected and mummified fruit promptly and improve airflow.
Why is my opal plum aphids?
Mealy plum aphid and leaf-curling aphid distort spring foliage and excrete sticky honeydew; tolerate light attacks for ladybirds, or spray with soft soap.
Why is my opal plum silver leaf?
Enters fresh pruning cuts and silvers foliage; prune only in mid-summer and seal nothing — keep cuts clean and small.
Why is my opal plum fruit splitting?
Heavy rain after dry spells splits the thin-skinned fruit; consistent watering and mulch reduce the swing in soil moisture.