Calathea insignis White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Cottony Scale Botrytis (Gray Mold)

search Possible Causes

error

Mealybugs

These small, soft-bodied insects secrete a white, waxy, cottony substance to protect themselves while feeding on the plant's sap. In Calathea insignis, they often cluster in the leaf axils or under the foliage where humidity is higher.

Very Common

lightbulb

How to confirm: Use a cotton swab dipped in rubbing alcohol to dab the white spots; if they dissolve and the insects move, it is 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 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 leaf axils and stems.

warning

Cottony Scale

Similar to mealybugs, scale insects produce a white, felt-like covering over their bodies. They attach to the stems and leaf undersides of Calathea, causing slow nutrient depletion and potential leaf yellowing.

Common

lightbulb

How to confirm: Look for small, brownish bumps underneath the white fluff on the stems or leaf petioles.

build How to fix it

shopping_cart Recommended Products

1 Treat the plant with an organic insecticide spray to eliminate the scale insects and their white protective coverings.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Manually remove visible scale insects from stems and leaf undersides using a cotton swab dipped in isopropyl alcohol.

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

warning

Botrytis (Gray Mold)

In high-humidity environments preferred by Calatheas, fungal spores can manifest as fuzzy, white patches on decaying organic matter or tender new growth. This is usually accompanied by localized leaf softening.

Common

lightbulb

How to confirm: Check if the white spots are accompanied by mushy, brown, or water-soaked lesions on the leaves.

build How to fix it

shopping_cart Recommended Products

1 Prune and remove all affected leaves immediately to prevent the fungal spores from spreading to healthy tissue.

2 Apply an organic fungicide to the plant to control the Botrytis growth and protect new foliage.