Lilium orientalis Marlon White Cottony Spots - Causes & Fixes

Jump to cause: Mealybugs Powdery Mildew Cottony Blotch (Botrytis)

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Mealybugs

These small insects secrete a white, waxy, cottony substance to protect themselves while feeding on the sap of the Lily. They tend to congregate in the crevices between the scales of the Marlon lily bulb or at the base of the flower buds.

Very Common

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How to confirm: Use a magnifying glass to look for tiny, slow-moving insects underneath the leaf axils or near the stem base.

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1 Apply an organic insecticide spray to the plant to eliminate existing mealybug adults, larvae, and eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

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2 Carefully wipe away the white cottony masses from the lily scales and flower buds using a cotton swab dipped in isopropyl alcohol.

3 Monitor the plant closely for new infestations and use yellow sticky traps to capture any migrating insects.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

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Powdery Mildew

This fungal pathogen manifests as a white, flour-like coating on the surface of the leaves and stems. In Oriental lilies like 'Marlon', it thrives in humid conditions with poor air circulation around the foliage.

Common

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How to confirm: Check if the white spots can be wiped off easily with your finger, leaving a slightly chlorotic patch underneath.

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shopping_cart Recommended Products

1 Apply an organic fungicide to the affected leaves and stems to eliminate the powdery mildew fungus.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the foliage and avoid overhead watering to prevent moisture from sitting on the leaves.

3 Prune and dispose of heavily infected leaves to prevent the spread of spores to healthy parts of the plant.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

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Cottony Blotch (Botrytis)

While typically associated with brown rot, early stages of Botrytis can appear as light-colored, fuzzy patches on the petals or foliage. This is common in large-flowered Oriental lilies during periods of high moisture.

Common

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How to confirm: Inspect the spots for any signs of underlying browning or soft, decaying tissue on the flower petals.

build How to fix it

shopping_cart Recommended Products

1 Remove and discard all infected petals and foliage immediately to prevent the fungal spores from spreading to healthy parts of the plant.

2 Apply an organic fungicide to protect remaining healthy tissues from further Botrytis development.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the lilies and avoid overhead watering to reduce the high moisture levels that trigger Cottony Blotch.