Troubleshooting
Silkworm Mulberry problems — and how to fix them
Silkworm Mulberry (Morus bombycis) 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.
Bacterial canker (Pseudomonas syringae)
Causes sunken lesions on stems and dieback of young shoots, especially after cold, wet spring weather. Prune out affected wood to healthy tissue, sterilise tools between cuts, and avoid overhead irrigation.
Mulberry fruit staining / fruit drop
Ripe berries drop heavily and stain paving, patios, and clothing permanently. Site trees away from hard surfaces, or choose a fruitless cultivar for ornamental use only.
Scale insects
Soft and armoured scales can encrust stems, secreting honeydew that leads to sooty mould. Treat with horticultural oil in late winter before buds break; encourage natural predators such as parasitic wasps.
Prevent silkworm mulberry problems before they start
Most silkworm mulberry issues are care-mismatch, not bad luck. Dial in the basics:
Silkworm Mulberry problems — FAQ
Why is my silkworm mulberry bacterial canker (pseudomonas syringae)?
Causes sunken lesions on stems and dieback of young shoots, especially after cold, wet spring weather. Prune out affected wood to healthy tissue, sterilise tools between cuts, and avoid overhead irrigation.
Why is my silkworm mulberry mulberry fruit staining / fruit drop?
Ripe berries drop heavily and stain paving, patios, and clothing permanently. Site trees away from hard surfaces, or choose a fruitless cultivar for ornamental use only.
Why is my silkworm mulberry scale insects?
Soft and armoured scales can encrust stems, secreting honeydew that leads to sooty mould. Treat with horticultural oil in late winter before buds break; encourage natural predators such as parasitic wasps.