Celeriac is a strong growing vegetable once it is
established and is unlikely to suffer any pests and diseases.
most likely pests are the Celery Fly (Philophylla heraclei),
the inevitable slugs and the fungus Celery Leaf Spot (Septoria
apii-graveolens). Details of how to recognise and treat these
pest and diseases are given below.
Any damage caused by the maggots of these flies will be noticed mainly
in April and May. The first signs are white, almost transparent areas on
the leaves. As the attack progresses, the white marks will turn brown
and the leaves will become distorted and start to shrivel.
sprays are available which work locally if applied in time. The flies
can be discouraged by ensuring that taller plants surround the celeriac.
The best solution however is to plant the plants in very late May to
early June when the flies are unlikely to be a problem. Sometimes a
second generation can occur in August but this is not common.
Slugs can eat the tips off young plants. See
our pages here on how
to deal with slugs.
Celery Leaf Spot
Brown marks develop on the leaves, mainly in wet and warm conditions.
The marks spread and join together. Remove any infected leaves as soon
as possible and burn them. Spray the plants with a fungicide.
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