Lilium Tarragona White Cottony Spots - Causes & Fixes

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

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Mealybugs

These small, soft-bodied insects secrete a white, waxy, cottony substance to protect themselves. They congregate in the crevices of the Lily's scales and under the leaves, sucking sap and weakening the plant.

Very Common

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How to confirm: Inspect the leaf axils and base of the bulb for tiny, slow-moving white insects embedded in the fluff.

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

2 Apply an organic insecticide spray to the plant, ensuring you coat the undersides of leaves and crevices where the white waxy substance is visible.

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3 Gently wipe away visible mealybug clusters using a cotton swab dipped in isopropyl alcohol to kill the insects on contact.

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Botrytis cinerea (Gray Mold)

While typically associated with gray fuzz, early stages of Botrytis on Lilium can appear as pale, cottony patches on petals or leaves. High humidity and poor airflow around the Tarragona Lily foliage promote this fungal growth.

Common

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How to confirm: Check if the white spots are accompanied by soft, decaying tissue or browning edges on the flower petals.

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

2 Apply an organic fungicide to treat the remaining healthy foliage and suppress further fungal growth.

Bonide Captain Jack's Copper Fungicide 32 oz

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3 Improve air circulation around the plant and reduce humidity by avoiding overhead watering and ensuring the plant is not crowded.

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Powdery Mildew

This fungal disease manifests as a white, flour-like coating on the surface of the leaves. It thrives in environments where there is high humidity but dry leaf surfaces.

Common

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How to confirm: Rub a finger over the spots; if they feel dusty and can be wiped off easily, 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

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the plant and avoid overhead watering to keep leaf surfaces dry, as moisture on leaves encourages fungal growth.

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