White Cabbage Cheer F1 White Cottony Spots - Causes & Fixes

Jump to cause: Powdery Mildew Mealybugs Sclerotinia (White Mold)

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Powdery Mildew

This fungal disease manifests as white, flour-like patches on the surface of cabbage leaves, which can eventually lead to leaf yellowing and stunted growth. It thrives in high humidity and moderate temperatures common during cabbage cultivation.

Very Common

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How to confirm: Check if the white spots look like a dusting of flour that can be partially rubbed off with your finger.

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1 Apply an organic fungicide to eliminate the existing fungal patches and prevent the spread to healthy leaves.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the cabbage plants and reduce humidity by spacing them properly to create a less favorable environment for mildew.

3 Remove and dispose of heavily infected leaves immediately to prevent fungal spores from spreading through the garden.

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Mealybugs

These small insects secrete a waxy, white, cottony substance to protect themselves as they feed on the plant's sap. Infestations often occur in the crevices of the cabbage leaves and can cause leaf wilting.

Common

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How to confirm: Inspect the undersides of the leaves and the base of the plant for tiny, moving white insects hidden within the fluff.

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1 Isolate the cabbage plant immediately to prevent the mealybugs from spreading to other plants in your garden or greenhouse.

2 Apply an organic insecticide spray to the affected areas, ensuring you target the crevices of the leaves where the white cottony masses are located.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Gently wipe away visible mealybug clusters with a cotton swab dipped in isopropyl alcohol to kill the insects on contact.

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Sclerotinia (White Mold)

A soil-borne fungal pathogen that causes cottony white mycelium to appear on the stems and leaves of brassicas like cabbage. If left untreated, it can cause the entire head or stem to rot away.

Common

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How to confirm: Look for firm, black, seed-like structures (sclerotia) embedded within the white fuzzy mass near the stem base.

build How to fix it

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 plants.

2 Apply an organic fungicide to the affected area 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 base of the plant to create an environment less hospitable to Sclerotinia.