White Cabbage Shelta F1 White Cottony Spots - Causes & Fixes

Jump to cause: Powdery Mildew Mealybug Infestation Sclerotinia (White Mold)

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Powdery Mildew

A fungal disease caused by Oomycetes or Ascomycetes that presents as white, flour-like patches on cabbage leaves. It thrives in high humidity and moderate temperatures, often restricting leaf expansion in Shelta F1 cultivars.

Very Common

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How to confirm: Check if the white spots can be rubbed off easily with your finger, leaving a pale mark underneath.

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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 cabbage leaves to prevent the disease from spreading to healthy foliage.

3 Improve air circulation around the plants and avoid overhead watering to reduce the high humidity that promotes mildew growth.

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Mealybug Infestation

Small, soft-bodied insects that secrete a white, waxy, cottony substance to protect themselves. They cluster in the leaf axils of the cabbage, sucking sap and potentially introducing secondary infections.

Common

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How to confirm: Look closely at the undersides of leaves and the base of the cabbage head for tiny, moving white insects.

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1 Isolate the cabbage from other plants and use a soft brush or cotton swab dipped in isopropyl alcohol to manually remove visible mealybug clusters.

2 Apply an organic insecticide spray to the plant to eliminate remaining insects and larvae.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Monitor the soil moisture levels to ensure the plant is not overwatered, as excess moisture can encourage pest environments.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Sclerotinia (White Mold)

A soil-borne fungal pathogen that produces white, cottony mycelium on plant tissues. In cabbages, it often starts at the base of the stem and can quickly envelop the entire head in a white fuzz.

Common

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How to confirm: Inspect the stem base for any signs of softening, browning, or small, hard black structures called sclerotia.

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shopping_cart Recommended Products

1 Remove and destroy all infected plant material and surrounding debris to prevent the fungal spores from spreading to healthy cabbage heads.

2 Apply an organic fungicide to the base of the stems to control the spread of the white mold.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve soil drainage and airflow around the cabbage base by using a well-aerated medium or adding perlite to the soil.