Septoria leaf spot
Septoria spp.
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How to spot it
Septoria leaf spot is a widespread fungal attack that affects above all tomatoes, celery, parsley and phlox. Typical are small, round to angular grey brown spots with a dark margin, in the middle of which you can make out fine black dots on close inspection. The attack usually begins on the lower leaves near the ground and moves upwards in damp weather. Left untreated, the leaves turn yellow and dry up, which weakens the plant and reduces the yield.
Prevention
Go for wide planting distances and good ventilation so that leaves dry off quickly after rain, and water at the base rather than overhead wherever possible. Remove infected leaves at once and dispose of them with the household waste rather than on the compost, so that the spores do not spread further. Practise crop rotation and do not grow susceptible species on the same ground for several years. Mulching under the plants prevents spores from splashing up out of the soil onto the lower leaves.
Affected plants
These plants in our database are especially susceptible.
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