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Dieffenbachia maculata White Cottony Spots
eco White Cottony Spots

Dieffenbachia maculata – White Cottony Spots

Why does your Dieffenbachia maculata have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.

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Jump to cause: Mealybugs Cottony Scale Powdery Mildew

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Mealybugs

These small insects secrete a white, waxy, cotton-like substance to protect themselves while feeding on the Dieffenbachia's sap. They typically cluster in the leaf axils or near the base of the stems.

Very Common
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How to confirm: Inspect the junctions between leaves and stems for tiny, moving white insects or sticky residue.
build How to fix it
shopping_cart Recommended Products
1 Isolate the plant immediately to prevent the mealybugs from spreading to your other houseplants.
2 Use a cotton swab dipped in isopropyl alcohol to manually remove the visible white cottony clusters from the leaf axils and stems.
3 Apply an organic insecticide spray to the entire plant to eliminate any remaining insects and larvae.
Bonide Captain Jack's Neem Oil 32 oz
Bonide Captain Jack's Neem Oil 32 oz
0.9 L • 1 pcs • Organic
$10
In Stock
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Cottony Scale

Similar to mealybugs, scale insects can produce a fuzzy white appearance on the surface of Dieffenbachia leaves. They attach themselves to the plant and suck nutrients, often causing yellowing around the spots.

Common
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How to confirm: Look for small, hard bumps under the white fuzz that do not move when prodded with a toothpick.
build How to fix it
shopping_cart Recommended Products
1 Treat the affected leaves and stems with an organic insecticide spray to eliminate the scale insects and their eggs.
Bonide Captain Jack's Neem Oil 32 oz
Bonide Captain Jack's Neem Oil 32 oz
0.9 L • 1 pcs • Organic
$10
In Stock
2 Manually remove visible white cottony clusters using a cotton swab dipped in isopropyl alcohol to prevent further infestation spread.
3 Isolate the plant from other houseplants to prevent the scale insects from migrating to healthy plants.
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Powdery Mildew

This fungal pathogen manifests as a white, dusty coating on the leaf surfaces. It thrives in high humidity and poor air circulation, common environments for Dieffenbachia.

Common
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How to confirm: Check if the white spots can be easily wiped off the leaf surface with your finger like dust.
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
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 levels to create an environment less hospitable to fungal growth.
3 Prune and dispose of any heavily infected leaves to prevent the pathogen from spreading to healthy foliage.
Fiskars 5/8" Bypass Pruning Shears
Fiskars 5/8" Bypass Pruning Shears
Cutting Tools
$13
In Stock

Other Dieffenbachia maculata problems

Your plant might also be experiencing one of these issues:

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local_hospital All symptoms eco All plants with white cottony spots
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