Anthurium andraeanum Amis White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Cottony Root Rot (Pythium/Phytophthora)

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Mealybugs

These small, soft-bodied insects secrete a white, waxy, cotton-like substance to protect themselves. They feed on the sap of the Anthurium leaves and stems, which can lead to leaf yellowing and stunted growth.

Very Common

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How to confirm: Inspect the crevices where the leaf meets the stem and the undersides of leaves for tiny moving insects covered in white fluff.

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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 waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

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3 Gently wipe away visible white cottony clusters from the stems and leaves using a cotton swab dipped in isopropyl alcohol.

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Powdery Mildew

This fungal disease manifests as white, powdery patches on the surface of the foliage. It thrives in Anthuriums kept in environments with high humidity but poor air circulation.

Common

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How to confirm: Check if the white spots appear more like a fine dust that can be rubbed off with your finger compared to thick cottony masses.

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1 Treat the affected leaves immediately with an organic fungicide to stop the spread of the powdery mildew.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the plant by spacing it away from other foliage and using a small fan if necessary.

3 Prune and discard any heavily infected leaves to prevent the fungus from spreading to healthy parts of the plant.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

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Cottony Root Rot (Pythium/Phytophthora)

While usually affecting roots, advanced fungal decay in the base of the Anthurium can sometimes produce white, mycelium-like growth near the soil line.

Common

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How to confirm: Gently lift the plant from its pot to see if the roots are dark, mushy, and accompanied by white fungal threads.

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1 Inspect the root system for mushy, dark, or foul-smelling roots and prune away any decayed sections using sterilized tools.

2 Repot the plant in a fresh, highly aerated medium to prevent further moisture retention, such as a mix containing Legigo Organic Leca Clay Pebbles (ID: 755) or Perlite (ID: 732) to improve drainage.