Hydrangea macrophylla Magical Coral Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are sap-sucking insects that congregate on the tender new growth of Hydrangeas, excreting a sugary substance known as honeydew. This residue creates the characteristic sticky film on the leaf surfaces.

Very Common

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How to confirm: Inspect the undersides of young leaves and stem nodes for tiny, pear-shaped green or black insects.

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1 Apply an organic insecticide to eliminate the aphid population and stop the production of honeydew.

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2 Gently wash the sticky residue off the leaves using a soft cloth or a gentle stream of water to prevent fungal growth.

3 Inspect the undersides of new growth regularly and use yellow sticky traps to monitor for any returning pests.

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Scale Insects

Scale insects attach themselves to the stems and leaves of Hydrangeas and feed on phloem sap, resulting in honeydew secretion. Unlike aphids, these pests often look like small, stationary bumps or shells on the plant.

Common

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How to confirm: Check for small, hard, brownish protrusions on the stems that do not move when poked.

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1 Apply an organic insecticide spray to the plant to kill the scale insects and remove the sticky honeydew residue.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Physically remove visible scale bumps from stems and leaves using a soft cloth or cotton swab dipped in rubbing alcohol.

3 Monitor the plant regularly with a magnifying glass to ensure new scale larvae are not developing.

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Whitefly Infestation

Whiteflies reside primarily on the undersides of Hydrangea leaves and excrete honeydew as they feed. A sudden cloud of tiny white insects may emerge when you disturb the foliage.

Common

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How to confirm: Gently shake a branch over a white piece of paper to see if small white insects flutter away.

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shopping_cart Recommended Products

1 Apply an organic insecticide spray to the undersides of the leaves to eliminate adult whiteflies and larvae.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Deploy yellow sticky traps near the foliage to capture flying adults and monitor the infestation level.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Wipe the sticky honeydew residue off the leaves with a damp cloth to prevent fungal growth and allow the plant to breathe.

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Sooty Mold (Secondary Infection)

While not the primary cause of stickiness, Sooty Mold is a fungus that grows on the honeydew left by pests. It creates a black, velvety coating that can eventually block sunlight to the hydrangea leaves.

Common

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How to confirm: Look for a black, soot-like layer covering the sticky residue on the leaf surface.

build How to fix it

shopping_cart Recommended Products

1 Identify and treat the underlying pest infestation (such as aphids or scale) that is producing the sticky honeydew by applying an organic insecticide.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Gently wash the black, velvety mold off the leaves using a soft cloth and water to restore sunlight absorption.

3 Apply a fungicide to prevent the spread of the mold and protect the plant's foliage.