Guy White (Unrecognized) White Cottony Spots - Causes & Fixes

error

Mealybugs

These small, soft-bodied insects secrete a white, waxy, cotton-like substance to protect themselves and their eggs. They cluster in crevices or on the undersides of leaves, feeding on plant sap.

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 likely mealybugs.

build How to fix it

shopping_cart Recommended Products

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

2 Treat the infestation by spraying the plant with an organic insecticide/miticide to eliminate the insects and their 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 crevices and leaf undersides.

error

Powdery Mildew

This fungal disease manifests as white, flour-like patches on leaf surfaces. It thrives in high humidity and poor air circulation, eventually causing leaves to curl or turn yellow.

Very Common

lightbulb

How to confirm: Check if the white substance can be wiped off the surface of the leaf with your finger, which is characteristic of fungal spores.

build How to fix it

shopping_cart Recommended Products

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

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the plant and reduce humidity by spacing plants further apart and avoiding overhead watering.

3 Prune and carefully dispose of any heavily infected leaves to prevent the fungus from spreading to healthy foliage.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

warning

Cottony Blotch (Sclerotinia)

Certain fungal pathogens produce white, mycelium-heavy growth that looks like cotton, often starting at the base of stems or near wounded tissue.

Common

lightbulb

How to confirm: Inspect the stem directly beneath the white patches for any signs of softening, browning, or mushy decay.

build How to fix it

shopping_cart Recommended Products

1 Remove and discard all heavily infected plant tissue and any surrounding debris to prevent the fungal spores from spreading to healthy parts of the plant.

2 Apply an organic fungicide to the affected area to control the spread of the Sclerotinia pathogen.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the plant and avoid overhead watering to ensure the base of the stems stays dry, reducing the moisture needed for fungal growth.

warning

Spider Mites (Egg Masses/Webbing)

While mites themselves are tiny, their webbing and egg clusters can appear as fine, white, cottony threads across the plant surface.

Common

lightbulb

How to confirm: Hold a white piece of paper under a leaf and tap it to see if tiny moving dots fall onto the paper.

build How to fix it

shopping_cart Recommended Products

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

2 Thoroughly spray the plant with an organic insecticide/miticide to eliminate existing mites, eggs, and webbing.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Wipe down leaves with a damp cloth and monitor the plant regularly using a moisture meter to ensure the environment doesn't become too dry, which favors mite growth.