Hydrangea macrophylla Magical Mont Blanc Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are small, soft-bodied insects that pierce the tender new growth of Hydrangeas to suck sap, excreting a sugary substance known as honeydew. This honeydew is the primary cause of the sticky residue on the leaf surfaces.

Very Common

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How to confirm: Inspect the undersides of young leaves and flower buds for tiny, green or black crawling insects.

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1 Apply an organic insecticide spray to the plant to eliminate the aphid population and stop the production of honeydew.

Bonide Captain Jack's Neem Oil 32 oz

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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 catch any remaining pests before they multiply.

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Scale Insects

Scale insects attach themselves to the stems and leaf petioles of Hydrangeas, feeding on nutrients and secreting honeydew. Unlike aphids, they appear as stationary, waxy bumps that are difficult to dislodge.

Common

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How to confirm: Check the stems for small, raised bumps that do not move when touched with a fingernail.

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shopping_cart Recommended Products

1 Apply an organic insecticide spray to the plant to kill the scale insects and remove the waxy protective coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Physically wipe the stems and leaves with a soft cloth or cotton swab soaked in rubbing alcohol to dislodge the stationary scale bumps.

3 Clean the surrounding area and plant saucer to remove excess honeydew and prevent secondary mold growth.

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Whitefly Infestation

Whiteflies congregate on the undersides of Hydrangea leaves; as they feed, they leave behind a sticky film of honeydew. You may notice small white insects fluttering when the foliage is disturbed.

Common

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

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the undersides of the leaves to eliminate the whitefly population and stop honeydew production.

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 adult whiteflies and prevent further egg-laying.

Super Ninja Fungus Gnat Traps - 30 Pack

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

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Sooty Mold (Secondary Symptom)

While not the root cause, Sooty Mold is a dark fungus that grows on the sticky honeydew left by pests. It can coat the 'Magical Mont Blanc' leaves in a black, powdery substance, eventually reducing photosynthesis.

Common

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How to confirm: Look for a black, velvety coating on top of the sticky residue on the leaf surface.

build How to fix it

shopping_cart Recommended Products

1 Identify and treat the underlying pests (such as aphids, scale, or whiteflies) that are producing the sticky honeydew by applying 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 black sooty mold off the leaves using a soft cloth and water to restore the plant's ability to photosynthesize.

3 Monitor the plant's environment and foliage regularly to ensure pests do not return and cause a new outbreak of honeydew.