Lilium OT Stentor – White Cottony Spots

Bonide Captain Jack's Neem Oil 32 oz

3 Improve air circulation around the lily and reduce humidity by avoiding overhead watering, ensuring the plant stays dry.

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Mealybug Infestation

Mealybugs are small insects that secrete a white, waxy, cottony substance to protect themselves. On Lilium OT hybrids, they tend to cluster at the base of the flower buds or in the leaf axils, sucking sap and weakening the plant.

Very Common

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How to confirm: Inspect the undersides of leaves and stem junctions for tiny, moving white insects or sticky honeydew residue.

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1 Isolate the plant immediately to prevent the mealybugs from spreading to other greenery and spray the affected areas with an organic insecticide.

$10

GROWIT Soil Moisture Meter - Blue

2 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony clusters from the leaf axils and flower buds.

3 Monitor the soil moisture levels to ensure the plant is not overly damp, as high humidity can encourage pest activity.

Water Meters

Bonide Captain Jack's Copper Fungicide 32 oz

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Powdery Mildew

This fungal disease creates a distinct white, powdery coating on the surface of the lily leaves. While it looks like dust, it can cause the foliage to distort or yellow over time.

Common

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How to confirm: Rub the white spots with your finger; if they wipe off easily like flour/dust, it is likely powdery mildew.

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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

2 Prune and dispose of any heavily infected leaves to reduce the fungal load on the plant; do not compost them.

3 Improve air circulation around the lily by spacing plants further apart and avoid overhead watering to keep foliage dry.

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Sclerotinia (White Mold)

This soil-borne fungus can attack the stems of lilies, producing white, cottony mycelium that wraps around the stem. It can cause the plant to collapse suddenly.

Common

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How to confirm: Check if the white growth is primarily concentrated around the base of the stem or near the soil line.

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1 Immediately prune and dispose of any stems or foliage showing white cottony growth to prevent the fungus from spreading to healthy tissue.

2 Apply an organic fungicide to the affected area and surrounding stems to control the spread of the mold.