Hydrangea macrophylla Magical Revolution Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are sap-sucking insects that pierce the tender stems and leaves of Hydrangeas to feed. As they feed, they excrete a sugary substance known as 'honeydew,' which creates the characteristic sticky residue on the leaf surfaces.

Very Common

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How to confirm: Inspect the undersides of new growth and leaf axils for tiny, pear-shaped 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 fungal growth like sooty mold.

3 Inspect the undersides of leaves and new growth regularly to catch any remaining pests before they multiply.

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Scale Insects

Scale insects attach themselves to the stems or leaves of the Hydrangea and suck nutrients. Like aphids, they produce honeydew as a byproduct of their feeding, which can coat the foliage in a sticky film.

Common

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How to confirm: Look for small, stationary bumps or shell-like growths on the stems that do not move when disturbed.

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1 Apply an organic insecticide spray to the foliage and stems 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 Wipe the leaves with a damp cloth to remove the sticky honeydew residue and prevent the growth of sooty mold.

3 Inspect the undersides of leaves and stems regularly to catch new infestations early.

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Whitefly Infestation

Whiteflies are small flying pests that congregate on the undersides of hydrangea leaves. Their feeding process results in honeydew secretion, which can lead to the growth of black sooty mold on top of the sticky residue.

Common

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How to confirm: Gently shake a branch to see if a cloud of tiny white insects emerges from the foliage.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the whitefly population and stop the secretion of honeydew.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Use yellow sticky traps to capture adult whiteflies and monitor the infestation levels.

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3 Gently wipe the undersides of the leaves with a damp cloth to remove the sticky residue and prevent sooty mold growth.

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Sooty Mold

While not the primary cause, sooty mold is a fungus that grows specifically on the honeydew left by other pests. It presents as a black, powdery coating that makes the leaves feel sticky and can eventually block photosynthesis.

Common

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How to confirm: Check if there is a dark, soot-like film covering the areas where the stickiness is most intense.

build How to fix it

shopping_cart Recommended Products

1 Identify and treat the underlying pest causing the honeydew secretion, such as aphids or scale, using an organic insecticide spray.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Gently wipe the black, powdery mold off the leaves with a soft cloth and water to restore photosynthesis.

3 Monitor soil moisture levels to ensure the plant is not under environmental stress, which can make it more susceptible to pest infestations.