Hydrangea macrophylla Magical Candy Rock Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are small, soft-bodied insects that pierce the tender stems and leaves of Hydrangeas to suck out sap, excreting a sugary substance known as honeydew. This honeydew creates the characteristic sticky residue on the leaf surfaces.

Very Common

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How to confirm: Inspect the undersides of the leaves and new growth for tiny, green or black moving 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 wipe the sticky residue off the leaves with a damp cloth to prevent the growth of sooty mold.

3 Inspect the undersides of leaves and new growth regularly to ensure no new pests are developing.

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Scale Insects

Scale insects attach themselves to the stems and leaf petioles of Hydrangea macrophylla, feeding on plant fluids and producing honeydew. Because they are stationary, they can be harder to spot than aphids.

Very Common

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How to confirm: Look for small, raised bumps or 'shells' on the stems that do not move when prodded with a fingernail.

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1 Apply an organic insecticide spray to the plant to kill existing scale insects and their eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

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

3 Clean the sticky honeydew residue from the leaves to prevent the growth of sooty mold.

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Whitefly Infestation

Whiteflies feed on the undersides of Hydrangea leaves, leaving behind sticky honeydew. When the plant is disturbed, small white flying insects may emerge from the foliage.

Common

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How to confirm: Gently shake a branch over a white piece of paper to see if tiny 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 Place yellow sticky traps near the foliage to capture flying adults and monitor the infestation level.

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3 Wipe the leaves with a damp cloth to remove the sticky honeydew residue and prevent fungal growth.

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Sooty Mold (Secondary Infection)

While not the primary cause of stickiness, sooty mold is a black fungus that grows specifically on the honeydew left by sap-sucking insects. This can make the leaves appear coated in dark, dusty grime.

Common

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How to confirm: Check if the sticky residue is accompanied by a black, soot-like coating on the leaf surface.

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shopping_cart Recommended Products

1 Identify and treat the underlying sap-sucking insects (such as aphids or scale) that are 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 dark, dusty sooty mold off the leaves using a soft cloth and water to restore the plant's ability to photosynthesize.

3 Monitor the plant's moisture levels to ensure the environment does not become overly humid, which can encourage fungal growth.