Anthurium andraeanum Matiz White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Pseudocercospora Leaf Spot

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Mealybugs

These small, sap-sucking insects produce a white, waxy secretion that looks exactly like cotton. They congregate in the crevices of the leaf stems and petiole bases on Anthuriums to feed on plant juices.

Very Common

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

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

2 Treat the infestation by spraying the plant with an organic insecticide to kill the insects and their waxy coatings.

Bonide Captain Jack's Neem Oil 32 oz

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3 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony clusters from leaf crevices and stem bases.

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Powdery Mildew

This fungal disease manifests as white, flour-like patches on the leaf surfaces. It thrives in Anthuriums kept in high humidity with poor air circulation around the foliage.

Common

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How to confirm: Check if the white spots are flat against the leaf surface and can be wiped off more easily than insect clusters.

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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

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2 Improve air circulation around the foliage and reduce localized humidity to create an environment less hospitable to fungal growth.

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

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Pseudocercospora Leaf Spot

While typically presenting as brown lesions, early stages or certain strains can present with irregular light-colored or fuzzy necrotic patches. This is a common fungal issue in tropical aroids under high moisture conditions.

Common

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How to confirm: Inspect the edges of the white spots to see if they are transitioning into dark brown or black necrotic tissue.

build How to fix it

shopping_cart Recommended Products

1 Apply a fungicide to treat the fungal lesions and prevent the spread of the infection to healthy leaves.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Prune and discard any heavily infected leaves to reduce the fungal load in your environment.

3 Improve air circulation around the plant and avoid overhead watering to keep the foliage dry, as high moisture promotes fungal growth.