Lily Tresor White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Cottony Cushion Scale Botrytis cinerea (Gray Mold)

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Mealybugs

These small, sap-sucking insects produce a white, waxy, cottony secretion to protect themselves as they feed on the Lily's tender stems and leaf undersides. Their feeding can lead to stunted growth and yellowing of the foliage.

Very Common

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How to confirm: Use a magnifying glass to look for tiny, crawling white insects tucked into the crevices where the leaves meet the stem.

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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 or neem oil to kill the insects and their waxy coatings.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

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3 Use a cotton swab dipped in isopropyl alcohol to manually remove visible white cottony clusters from the stems and leaf undersides.

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Cottony Cushion Scale

This scale insect species covers itself in a thick, white, waxy fluff that resembles cotton. They attach firmly to the lily's stems and can cause the plant to exude honeydew, which may lead to secondary sooty mold.

Common

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How to confirm: Check if the white spots are stationary and attached firmly to the stem rather than moving like insects.

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1 Treat the plant with an organic insecticide/miticide spray to eliminate the scale insects and their waxy protective coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Physically remove visible scale insects and cottony masses from the stems using a soft cloth or cotton swab dipped in rubbing alcohol.

3 Clean the surrounding leaves and pot to remove honeydew residue and prevent the development of secondary sooty mold.

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Botrytis cinerea (Gray Mold)

In high humidity, this fungal pathogen can manifest as fuzzy, light-colored patches on lily petals or leaves before turning dark gray. It thrives in damp environments where air circulation is poor around the Lily Tresor's foliage.

Common

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How to confirm: Inspect if the white spots are accompanied by soft, decaying tissue or browning of the leaf edges.

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1 Prune and remove all infected leaves and petals immediately to prevent the fungus from spreading to healthy tissue.

2 Apply an organic fungicide to treat the existing infection and protect the remaining foliage.