Acer monspessulanum Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids feed on the phloem of the Montpellier Maple, excreting 'honeydew,' a sticky, sugar-rich substance that coats the leaf surfaces. This often leads to secondary growth of black sooty mold.

Very Common

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How to confirm: Inspect the undersides of young leaves and developing buds for small, soft-bodied 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 Gently wash the sticky residue and any secondary sooty mold off the leaves using a soft cloth or a gentle stream of water.

3 Inspect the undersides of leaves and new growth regularly to ensure no new aphids have emerged.

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Scale Insects

Scale insects attach themselves to the stems or leaf petioles of Acer monspessulanum and secrete honeydew as they feed on sap. Unlike aphids, these pests are often stationary and look like small bumps.

Common

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How to confirm: Look for tiny, hard, scale-like protrusions on the twigs and leaf stalks.

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1 Apply an organic insecticide spray to the plant to eliminate the scale insects and stop the secretion of honeydew.

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 and water to remove the accumulated honeydew and prevent fungal growth.

3 Inspect the undersides of leaves and crevices for any remaining small bumps to ensure the infestation is fully controlled.

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Sooty Mold Growth

While not the primary cause, sooty mold grows on top of the sticky residue left by sap-sucking insects. It appears as a black, powdery coating that can block photosynthesis in the maple leaves.

Common

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How to confirm: Check if the stickiness is accompanied by a dark, charcoal-like film covering the leaf surface.

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1 Identify and treat the underlying sap-sucking insects (such as aphids or scale) using an organic insecticide spray to stop the production of sticky honeydew.

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

3 Monitor the tree's health and soil moisture levels to ensure the plant is not under environmental stress, which can make it more susceptible to pests.

GROWIT Soil Moisture Meter - Teal

Water Meters

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Treehoppers

Treehoppers feed on the sap of deciduous trees like Acer monspessulanum and produce significant amounts of honeydew. Their presence is often marked by large droplets of sticky residue falling from the canopy.

Common

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How to confirm: Gently shake a branch over a white cloth to see if small, jumping insects fall out.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the tree canopy to eliminate the treehopper 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 tree regularly using a moisture meter to ensure the tree remains hydrated, as sap-sucking insects can cause water stress.