Hydrangea macrophylla Magical Ouverture 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 residue is what creates the characteristic sticky film on the foliage.

Very Common

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

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the foliage to eliminate the aphid 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 Gently wash the leaves with water or a mild soap solution to remove the sticky residue and prevent the growth of 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 hydrangea stems and leaf petioles, feeding on plant fluids. Like aphids, they excrete honeydew which can coat the 'Magical Ouverture' leaves in a sticky layer.

Common

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How to confirm: Look for small, hard, bump-like protrusions firmly attached to the stems or leaf veins.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the stems and leaves 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 wipe away the sticky honeydew residue from the leaves using a soft cloth dampened with water or insecticidal soap.

Bonide Captain Jack's Insecticidal Super Soap 32 oz

0.9 L • 1 pcs • Organic

$11

In Stock

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

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Whitefly Infestation

Whiteflies congregate on the undersides of hydrangea leaves; as they feed, they release honeydew that drips onto the leaves below, making them feel tacky.

Common

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How to confirm: Gently shake a branch to see if a cloud of tiny white insects flies up 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 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 leaves with a damp cloth to remove the sticky honeydew residue and prevent fungal growth.

Flora Premium Plant Mister

Spray Bottles

$12

In Stock

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Sooty Mold (Secondary Condition)

While not the primary cause of stickiness, sooty mold is a black fungus that grows directly on the honeydew left by pests. This can eventually coat the 'Magical Ouverture' blooms and leaves in a dark, crusty layer.

Common

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How to confirm: Check if the sticky residue has developed a black, powdery appearance that cannot be easily wiped away.

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 wash the leaves with water or a mild soap solution to remove the black sooty mold layer and restore photosynthesis.

Bonide Captain Jack's Insecticidal Super Soap 32 oz