Acer palmatum Red Sunset Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are small, soft-bodied insects that pierce the tender new growth of Red Sunset Maples to suck out sap. As they feed, they excrete a sugary substance known as honeydew, which creates the sticky residue on leaf surfaces.

Very Common

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How to confirm: Inspect the undersides of young leaves and stems for tiny, green or black moving insects.

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1 Apply an organic insecticide spray to the leaves and new growth to eliminate the aphid population and stop honeydew production.

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2 Wash the sticky residue off the leaves using a firm stream of water from a garden hose to prevent fungal growth like sooty mold.

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

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Scale Insects

Scale insects attach themselves to the bark or leaf petioles of the maple and feed on sap. Like aphids, they produce honeydew that drips onto the foliage below, often leading to secondary growth of black sooty mold.

Very Common

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How to confirm: Look for small, stationary bumps or hard scales on the stems and leaf stalks.

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1 Apply an organic insecticide spray to the foliage and bark 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 Gently wipe the sticky leaves and stems with a soft cloth or cotton swab dipped in rubbing alcohol to remove honeydew and scale residue.

3 Inspect the plant regularly for new scale infestations and ensure the plant is not in a location that promotes pest buildup.

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Sooty Mold

While not a primary cause, sooty mold is a fungus that grows on the honeydew left by sap-sucking insects. While it doesn't attack the tree directly, the thick black coating can interfere with the Red Sunset Maple's photosynthesis.

Common

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How to confirm: Check if the sticky residue is accompanied by a black, powdery film covering the leaves.

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1 Identify and treat the underlying sap-sucking insects (such as aphids or scale) that are producing the sticky honeydew using an organic insecticide.

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 with a soft cloth or a gentle stream of water to restore the tree's ability to photosynthesize.

3 Monitor the tree's health and ensure it is not under excessive stress from pests or environmental factors.

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Poplar/Leafhopper Damage

Leafhoppers pierce individual plant cells to feed, leaving behind honeydew. In Red Sunset Maples, this often results in both stickiness and fine, stippled white spots on the leaf surface.

Common

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How to confirm: Gently shake a branch over a white piece of paper to see if small, jumping insects appear.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the leafhopper 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 Wash the leaves with a gentle stream of water to remove the sticky residue and prevent the growth of sooty mold.

3 Monitor the plant closely using a moisture meter to ensure the tree remains hydrated, as pest stress can impact water uptake.