Kohlrabi Timpano F1 White Powder - Causes & Fixes

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Powdery Mildew

This is the most common cause of white, flour-like patches on kohlrabi leaves. It is a fungal disease caused by species like Podosphaera tuberosae that thrives in high humidity and moderate temperatures.

Very Common

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How to confirm: Check if the white patches are primarily on the upper surface of the leaves and if they can be rubbed off easily with your finger.

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1 Apply an organic fungicide to the affected leaves to stop the spread of the fungal spores.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and remove any heavily infected leaves immediately, ensuring you dispose of them away from your garden to prevent further contamination.

3 Improve air circulation around your kohlrabi plants and avoid overhead watering to reduce the humidity that fuels mildew growth.

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Whiteflies

Small, winged insects can congregate on the undersides of kohlrabi foliage, leaving behind white residue and honeydew. Their presence often leads to secondary issues like sooty mold.

Common

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How to confirm: Tap the plant gently to see if a cloud of tiny white insects flies away from the leaves.

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1 Apply an organic insecticide to eliminate the whitefly population and kill larvae/eggs on the foliage.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Use yellow sticky traps to capture adult whiteflies and monitor the severity of the infestation.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

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3 Thoroughly wash the undersides of the kohlrabi leaves with a strong stream of water to remove the white residue and honeydew.

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Diatomaceous Earth residue

If you have recently treated your kohlrabi for pests, a fine white powder may simply be a layer of organic dust left on the leaf surface.

Common

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How to confirm: Inspect the soil surface and nearby garden tools to see if a similar white powder is present.

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1 Gently rinse the leaves of your Kohlrabi with a soft stream of water to remove the Diatomaceous Earth residue.

2 Monitor the plant for any signs of powdery mildew or pests that may have been the original reason for the treatment.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

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Salt Accumulation

Excessive use of certain fertilizers or hard water can lead to white salt crusts appearing on the leaf margins or surface of the kohlrabi bulbs and leaves.

Common

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How to confirm: Examine if the white patches are accompanied by 'leaf burn' or crispy, necrotic edges on the foliage.

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1 Flush the soil thoroughly with clean, distilled, or rainwater to leach out accumulated mineral salts from the root zone.

2 Monitor soil moisture levels closely to prevent future over-fertilization or waterlogged conditions using a moisture meter.