Hydrangea macrophylla Magical Pacific Sticky Leaves - Causes & Fixes

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Aphid Infestation

Small, soft-bodied insects known as aphids congregate on the tender new growth of Hydrangea macrophylla, excreting a sugary substance called honeydew that creates a sticky residue.

Very Common

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How to confirm: Inspect the undersides of young leaves and terminal buds 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.

Bonide Captain Jack's Neem Oil 32 oz

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2 Wash the sticky residue off the leaves using a firm stream of water or a mild insecticidal soap to prevent fungal growth.

Bonide Captain Jack's Insecticidal Super Soap 32 oz

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3 Inspect new growth regularly and use yellow sticky traps to monitor for any returning flying aphids.

Super Ninja Fungus Gnat Traps - 30 Pack

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Scale Insects

Scale insects attach themselves to stems and leaves, sucking sap from the plant and leaving behind a sticky honeydew coating on the foliage surface.

Very Common

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How to confirm: Look for small, stationary bumps or scales firmly attached to the stems or leaf veins that can be scraped off with a fingernail.

build How to fix it

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

3 Inspect the undersides of leaves and crevices for any remaining pests to prevent a secondary infestation.

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Whitefly Infestation

Tiny white insects inhabit the undersides of the leaves and excrete honeydew, which can also lead to the growth of black sooty mold on the sticky surface.

Common

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

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 Wipe the leaves with a damp cloth to remove the sticky residue and any developing sooty mold.

3 Use yellow sticky traps to capture adult whiteflies and monitor for new infestations.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

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Sooty Mold Growth

While not the primary cause, this black fungus grows specifically on the sticky residue (honeydew) left by piercing-sucking insects, often making the leaves look dirty.

Common

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How to confirm: Check if the sticky substance is accompanied by a dark, crusty, or powdery black layer that can be wiped away.

build How to fix it

shopping_cart Recommended Products

1 Identify and treat the underlying insect pest, such as aphids or scale, using an organic insecticide spray to stop the production of honeydew.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Gently wipe the black sooty mold from the leaves with a soft cloth and water to restore the plant's ability to photosynthesize.

3 Monitor soil moisture levels to ensure the plant remains healthy and resilient against secondary fungal infections.