Kalanchoe Passion Thalia White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Cottony Blight (Botrytis)

search Possible Causes

error

Mealybugs

These small, soft-bodied insects secrete a white, waxy, cottony substance to protect themselves while feeding on the sap of Kalanchoe stems and leaves. They often cluster in the crevices where the leaf meets the stem.

Very Common

lightbulb

How to confirm: Use a cotton swab dipped in rubbing alcohol to dab the white spots; if they dissolve and turn brown, it is mealybug infestation.

build How to fix it

shopping_cart Recommended Products

1 Isolate the plant immediately to prevent the mealybugs from spreading to your other houseplants.

2 Treat the infestation by spraying the plant with an organic insecticide/miticide to kill the insects and their protective waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony clusters from the crevices of the stems and leaves.

warning

Powdery Mildew

This fungal disease manifests as a white, flour-like coating on the leaf surfaces, often appearing when humidity is high or airflow is poor around the succulent foliage. It can eventually cause the leaves to yellow and drop.

Common

lightbulb

How to confirm: Check if the white substance can be wiped off easily with your finger and if it looks like a dusting of flour rather than distinct tufts.

build How to fix it

shopping_cart Recommended Products

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

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Improve air circulation around the plant and reduce humidity by avoiding overhead watering on the foliage.

3 Prune and dispose of any heavily infected leaves to prevent the mildew from spreading to the rest of the Kalanchoe.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

warning

Cottony Blight (Botrytis)

In high-moisture environments, Botrytis can cause greyish-white fuzzy patches on decaying organic matter or succulent leaves of the Kalanchoe. This is usually accompanied by soft, water-soaked lesions.

Common

lightbulb

How to confirm: Inspect the base of the white spots for signs of mushy, decaying leaf tissue or dark necrotic spots.

build How to fix it

shopping_cart Recommended Products

1 Prune away all affected leaves and stems showing white fuzzy patches using sterilized shears to prevent the fungus from spreading to healthy tissue.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

2 Apply an organic fungicide to the plant to combat the Botrytis spores and protect remaining healthy foliage.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Improve air circulation around the plant and reduce humidity by ensuring the soil surface dries out between waterings; use a moisture meter to monitor soil levels.