Troubleshooting
Fischer's Begonia problems — and how to fix them
Fischer's Begonia (Begonia fischeri) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Bacterial leaf blight (Xanthomonas axonopodis)
Angular, water-soaked lesions with yellow halos appear on leaves, spreading rapidly in warm, wet conditions; remove infected material immediately, avoid overhead watering, and apply a copper-based bactericide as a preventative in humid seasons.
Thrips on flowers and buds
Western flower thrips (Frankliniella occidentalis) cause silvery streaking on petals and distorted buds; use sticky blue traps to monitor levels and treat with spinosad-based or insecticidal soap sprays at the first sign of damage.
Prevent fischer's begonia problems before they start
Most fischer's begonia issues are care-mismatch, not bad luck. Dial in the basics:
Fischer's Begonia problems — FAQ
Why is my fischer's begonia bacterial leaf blight (xanthomonas axonopodis)?
Angular, water-soaked lesions with yellow halos appear on leaves, spreading rapidly in warm, wet conditions; remove infected material immediately, avoid overhead watering, and apply a copper-based bactericide as a preventative in humid seasons.
Why is my fischer's begonia thrips on flowers and buds?
Western flower thrips (Frankliniella occidentalis) cause silvery streaking on petals and distorted buds; use sticky blue traps to monitor levels and treat with spinosad-based or insecticidal soap sprays at the first sign of damage.