Kale

Kale belongs belongs to the species Brassica oleracea, as do broccoli, cauliflower and red cabbage. Kale is a leafy crop that can be grown on all types of soil.

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Foto: Rasbak – CC BY-SA 3.0

Kale belongs belongs to the species Brassica oleracea, as do broccoli, cauliflower and red cabbage. Kale is a leafy crop that can be grown on all types of soil. Early variety kale sow from May to July, transplant a month and a half after sowing, harvest as early as fall. The early variety of kale is not very hardy; the winter variety is. Sow these in July, transplant in mid-September, harvest in winter. Winter kale can be sown as a secondary crop on beds where beets or broad beans have been grown.
Remove leaves affected by cabbage flies and fungi.
Autumn kale is susceptible to downy mildew, a water fungus. Harvest the kale quickly as soon as the first yellowed leaves appear. Under humid conditions (autumn), downy mildew spreads over the entire plant in a matter of weeks. With frost, the spread stops.

Bugs

Poor growth; maggots in the root: cabbage fly (Delia radicum).

Caterpillars, photo: Maarten Bouwman

Leaf is eaten by caterpillars of large white (Pieris brassicae) and cabbage moth (Mamestra brassicae).

recognizing aphids on cabbage
Gray-blue aphids of the cabbage aphid, photo: Rasbak – CC BY-SA 3.0

Initially white or purple spots on misshapen leaves (curled, bumpy), then the kale is colonized by aphids: cabbage aphid (Brevicoryne brassicae).

Cabbage leaf roller, photo: Rasbak – CC BY-SA 3.0

Curled leaves and damage to leaves, flower bud and stem: larvae of the Cyclamen tortrix (Clepsis spectrana).

Cabbage whitefly, photo: Rasbak – CC BY-SA 3.0

White flies colonize the underside of the leaf. They live on leaf sap and secrete honeydew: cabbage whitefly (Aleyrodes proletella). Sooty dew then forms on the honeydew.

Curled leaves; in some places there is an aphid of about 2 mm in size: Green peach aphid (Myzus persicae).

Feeding on root or stem of young cabbage plant: the larvae of beetles (family Elateridae).

recognize house snails
Young land snails eat kale bare, photo: Simone Goslinga

Warm and humid autumn weather keeps land snails active longer and populates cabbage plants en masse.

Fungi & diseases

recognize fungi on kale
Yellowing due to downy mildew, photo: Marc Eschbach

Leaf yellows and turns brown, eventually the leaves fall off: downy mildew (Peronospora parasitica).

Black fungus on honeydew secreted by aphids and cabbage whiteflies: sooty mold.

Poor growth, plant wilting, swollen roots rotting away: clubroot (Plasmodiophora brassicae). Kale is less susceptible, but can sustain the fungus.

Other

In the winter when there is little food for birds to find, pigeons sometimes like to feast on kale in the fields.

Plant different types of kale: plant next to autumn kale, which is susceptible to downy mildew, a winter kale. This can remain on land for longer.

Leaf margins turn brown: lime deficiency.

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