Lily Keynote White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Botrytis Blight (Gray Mold) Powdery Mildew

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Mealybugs

These small, soft-bodied insects secrete a white, waxy, cotton-like substance to protect themselves as they feed on the lily's sap. They often congregate in the crevices between the Lily Keynote's scale-like leaves or near the base of the flower buds.

Very Common

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How to confirm: Use a cotton swab dipped in rubbing alcohol to wipe the spots; if the white material dissolves and reveals small insects, it is mealybugs.

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1 Isolate the lily from other plants immediately to prevent the mealybugs from spreading to your entire collection.

2 Apply an organic insecticide spray to the affected areas, ensuring you coat the white waxy clusters and crevices where insects hide.

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3 Use a cotton swab dipped in isopropyl alcohol to manually remove visible mealybug clusters from the leaf bases and buds.

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Botrytis Blight (Gray Mold)

This fungal pathogen thrives in high humidity and can manifest as fuzzy, grayish-white patches on the petals or foliage of Oriental lilies. In advanced stages, it can cause the large 'Keynote' blooms to rot and collapse.

Common

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How to confirm: Inspect if the white spots are accompanied by brown, decaying tissue or if the fungus appears more 'fuzzy' and spreading across petals.

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1 Immediately remove and dispose of all infected flowers and foliage to prevent the fungal spores from spreading to healthy parts of the plant.

2 Apply an organic fungicide to the affected areas to control the spread of the Botrytis pathogen.

Bonide Captain Jack's Copper Fungicide 32 oz

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3 Improve air circulation around the lily and reduce humidity by avoiding overhead watering, which keeps the petals dry.

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Powdery Mildew

This fungal disease presents as a white, flour-like coating on the surface of the leaves. While it doesn't always kill the plant immediately, it can stress the Lily Keynote, reducing the vigor of its characteristic large blooms.

Common

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How to confirm: Check if the white patches appear as a flat, powdery dust that can be rubbed off the leaf surface with your finger.

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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

In Stock

2 Prune and dispose of any heavily infected leaves to reduce the fungal load on the plant.

3 Improve air circulation around the Lily Keynote by spacing plants properly and ensuring they are not in overly humid, stagnant areas.