Geranium phaeum White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Cottony Cushion Scale

search Possible Causes

error

Mealybugs

Small, soft-bodied insects that secrete a white, waxy, cottony substance to protect themselves and their eggs. They tend to congregate in the crevices of Geranium phaeum leaves and near the base of the stems, feeding on plant sap.

Very Common

lightbulb

How to confirm: Inspect the undersides of leaves and stem junctions for tiny moving insects covered in white fuzz.

build How to fix it

shopping_cart Recommended Products

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

2 Treat the infestation by spraying the plant with an organic insecticide or neem oil to kill the insects and remove the 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 rubbing alcohol to manually remove any visible white cottony clusters from leaf crevices and stem bases.

error

Powdery Mildew

A fungal disease caused by various species of Ascomycete fungi that thrive in high humidity and poor air circulation. It presents as a white, flour-like coating on the surface of the foliage rather than distinct cottony clumps.

Very Common

lightbulb

How to confirm: Check if the white patches appear as a thin film across large leaf surfaces rather than localized tufts.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic fungicide to the affected leaves to eliminate the fungal spores and prevent further spread.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and dispose of heavily infected foliage to reduce the fungal load and improve air circulation around the plant.

3 Increase air circulation and reduce humidity around the plant by spacing it away from other dense greenery.

warning

Cottony Cushion Scale

A type of scale insect that produces a thick, white, wax-like secretion. While less common on Geranium phaeum than mealybugs, it can cause significant sap depletion and leaf yellowing.

Common

lightbulb

How to confirm: Look for small, hard bumps underneath the white waxy coating on the stems.

build How to fix it

shopping_cart Recommended Products

1 Treat the plant with an organic insecticide/miticide spray to eliminate the scale insects and their waxy secretions.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Physically remove visible white cottony clusters from the stems and leaves using a cotton swab dipped in rubbing alcohol.

3 Isolate the affected Geranium from other houseplants to prevent the scale from spreading to healthy plants.