Hydrangea macrophylla Magical Summergreen Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are common pests for Hydrangea macrophylla that suck sap from tender new growth, excreting a sugary substance known as honeydew. This residue creates the characteristic sticky film on leaf surfaces.

Very Common

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How to confirm: Inspect the undersides of young leaves and terminal buds 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 Wash the leaves with a gentle stream of water to remove the sticky residue and any remaining pests.

3 Monitor the plant using yellow sticky traps to capture any newly emerging winged aphids.

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Scale Insects

Scale insects attach themselves to the stems and leaves of the hydrangea, feeding on phloem sap. Like aphids, they excrete honeydew which can coat the foliage in a sticky layer.

Common

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How to confirm: Look for small, stationary bumps or shell-like structures firmly attached to the stems or leaf petioles.

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shopping_cart Recommended Products

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

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Whitefly Infestation

Whiteflies congregate on the undersides of hydrangea leaves and excrete honeydew as they feed. This can lead to a sticky texture and often results in a fine white powder (sooty mold) developing on the residue.

Common

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How to confirm: Gently shake a branch to see if tiny white insects fly upward from the leaf undersides.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the whitefly population and stop the production 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 severity of the infestation.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

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 (Secondary Infection)

While not the primary cause of stickiness, sooty mold is a black fungus that grows on the honeydew left by sap-sucking insects. It can make the leaves feel gritty and look dark/dirty.

Common

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How to confirm: Check if the stickiness is accompanied by a black, velvety coating on the leaf surface.

build How to fix it

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, gritty residue from the leaves using a soft cloth and water to remove the sooty mold and allow the plant to breathe.

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