Celery leaf spot
Septoria apiicola
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How to spot it
Celery leaf spot is the most important fungal disease on celeriac and celery. Roundish, light brown spots with a dark margin form on the leaves, with tiny black dots in their centre: the spore containers of the fungus. With a heavy infestation the foliage yellows over large areas and dries up, which noticeably reduces the yield and the size of the bulbs.
Prevention
Use dressed seed, or seed that is at least two years old, since the fungus survives on the grain. Keep a wide planting distance so that plants dry off quickly, water in the morning at the root rather than over the foliage and remove the first infested leaves at once. A three to four year break from growing celery on the plot interrupts the infection cycle.
Affected plants
These plants in our database are especially susceptible.
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