Troubleshooting
Telegraph Cucumber problems — and how to fix them
Telegraph Cucumber (Cucumis sativus 'Telegraph Improved') 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.
Bitter fruit
Caused by water stress, heat spikes or — in non-all-female lines — pollination of female flowers. Keep watering steady and remove any male flowers if growing an older mixed-flower strain.
Powdery mildew
White patches on leaves in stuffy, dry-rooted plants. Ventilate, keep roots moist, and avoid wetting foliage; remove badly affected leaves.
Spider mite / red spider
Fine webbing and mottled leaves in hot, dry greenhouse air. Raise humidity by damping down and introduce predatory mites early.
Stem / collar rot
Base goes soft and brown from overwatering against the stem. Plant on a slight mound, water around — not onto — the collar, and improve drainage.
Prevent telegraph cucumber problems before they start
Most telegraph cucumber issues are care-mismatch, not bad luck. Dial in the basics:
- Common cucumber problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Telegraph Cucumber watering schedule
- Telegraph Cucumber light requirements
- Best soil mix for telegraph cucumber
- Telegraph Cucumber temperature & humidity
- Full telegraph cucumber care guide
Looking for telegraph cucumber in general rather than its problems? Read the full telegraph cucumber care guide — light, water, soil and feeding.
Telegraph Cucumber problems — FAQ
Why is my telegraph cucumber bitter fruit?
Caused by water stress, heat spikes or — in non-all-female lines — pollination of female flowers. Keep watering steady and remove any male flowers if growing an older mixed-flower strain.
Why is my telegraph cucumber powdery mildew?
White patches on leaves in stuffy, dry-rooted plants. Ventilate, keep roots moist, and avoid wetting foliage; remove badly affected leaves.
Why is my telegraph cucumber spider mite / red spider?
Fine webbing and mottled leaves in hot, dry greenhouse air. Raise humidity by damping down and introduce predatory mites early.
Why is my telegraph cucumber stem / collar rot?
Base goes soft and brown from overwatering against the stem. Plant on a slight mound, water around — not onto — the collar, and improve drainage.