🐛✗ Tested and false“Celery leaf spot only comes from wet weather or dirty soil, not from your own saved seed”
Contaminated seed is the primary way this fungus gets into a new planting, not soil or weather on its own. Storing seed for at least two years measurably cuts down how much of the pathogen survives on it, which matters if you're working through home-saved seed rather than assuming it's automatically clean. Weather and plant debris matter for spreading the disease once it's established in a bed, but seed is the main route it arrives by in the first place.
What to do: Buy celery seed from a reputable supplier where you can. If sowing home-saved or older seed, hold it back at least two years before use to reduce surviving infection, or treat it in hot water first.
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“All celery varieties are equally vulnerable to leaf spot, so variety choice makes no difference”
At least one celery variety sold in the UK, Granada, is specifically named as resistant to leaf spot. Varietal resistance in this disease is a real, bred-in trait rather than a marketing line, though picking a resistant variety reduces risk rather than removing it outright, so it works best alongside rotation and clean seed rather than instead of them.
What to do: If leaf spot has been a repeat problem on your plot, look for Granada or another variety specifically marketed as leaf-spot resistant when buying celery seed.
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“Celeriac is a different crop from celery, so leaf spot in one won't affect the other”
Celeriac and celery are the same species, Apium graveolens, grown for the root instead of the stalks, so they carry the same leaf spot risk. Ground where either crop has grown in the past few years should be avoided for the other, not just for a repeat planting of the same one, since the fungus doesn't distinguish between the two forms of the plant.
What to do: Rotate celery and celeriac together as a single crop group rather than treating them as separate, keeping both off the same ground for three to four years.
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- RHS: Celery grow your ownAdvises avoiding growing celery in soil where celery or its close relative celeriac have been grown in the past few years.
“You can just trim off the spotted leaves and safely eat the rest of the celery”
Neither institutional source consulted for this disease makes any statement about whether stalks or leaves affected by leaf spot are safe to eat, trimmed or otherwise. Both treat it purely as a plant-health and yield problem, covering identification, spread and crop loss, with no food-safety guidance attached.
Our read Septoria apiicola is a foliar plant pathogen, not one of the fungi linked to mycotoxins or other food-safety warnings, so there's no obvious reason to expect a hidden health risk from eating trimmed, otherwise healthy-looking stalks. That's a reasonable inference from what kind of organism it is, not a tested finding from either source, so this stays unproven rather than confirmed safe.
What to do: Cut away spotted, blackened or badly affected tissue and discard stalks that are heavily marked. Treat this as ordinary kitchen judgement about damaged produce rather than a food-safety rule backed by a tested source.
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