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Powdery Mildew - Carrots

Eryisiphe heraclei

Pathogen

Fungus

Hosts

Carrots

Symptoms

White, powdery fungal growth can initially be found on the older leaves and stems which then spreads to the newer developing leaves before eventually colonising the entire plant. Under severe disease pressure the leaves turn brown, twisted and brittle before shrivelling and dying.

Development

In favourable conditions airborne spores land on leaves and penetrate into the host plant cells. Initially seen as small white spots which gradually enlarge to form a powdery mycelium. These produce spore forming structures releasing conidia which spread the disease further. Overwinters on crop debris or other host plants which include wild carrot, celery, parsley, parsnip as well as a range of other closely related umbelliferous herbaceous plants.

Favourable factors

Hot, dry summers.

Importance

A commonly occurring disease. If left untreated early infections can cause economic yield loss.

Control

Identification and Management of carrot diseases

Find out more information on the key disease threats to your carrot crop. For each disease you will find out the importance of the disease in terms of potential yield penalty, how to identify the disease in its early stages and our advice on the best control strategies.

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