Rhododendron arboreum Sticky Leaves - Causes & Fixes

error

Scale Insects

Scale insects attach themselves to the stems and leaf undersides of Rhododendron arboreum, secreting honeydew (a sticky sugar-rich substance) as they feed on plant sap.

Very Common

lightbulb

How to confirm: Inspect the undersides of leaves and woody stems for small, immobile bumps or shell-like growths.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the plant 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 and stems with a damp cloth to remove the sticky honeydew residue and prevent fungal growth.

3 Prune away heavily infested stems to reduce the insect population and prevent further spread to healthy parts of the tree.

Gonicc 8" Titanium Bypass Pruners GPPS-1003

Cutting Tools

$15

In Stock

error

Aphid Infestation

Aphids are soft-bodied insects that congregate on new growth and flower buds of the tree rhododendron, excreting large amounts of sticky honeydew.

Very Common

lightbulb

How to confirm: Look for tiny, pear-shaped insects clustered on tender new shoots or leaf edges.

build How to fix it

shopping_cart Recommended Products

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

0.9 L • 1 pcs • Organic

$10

In Stock

2 Gently wash the sticky leaves with a soft cloth or a gentle stream of water to remove the accumulated honeydew and prevent fungal growth.

3 Inspect new growth and flower buds regularly to ensure no new aphids are colonizing the plant.

warning

Sooty Mold

This is not a primary infection but a secondary fungus that grows on the sticky honeydew left behind by sucking insects, coating the leaves in a black, powdery residue.

Common

lightbulb

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

build How to fix it

shopping_cart Recommended Products

1 Identify and treat the underlying insect pests, such as aphids or scale, using an organic insecticide 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 wash the black, powdery residue off the leaves with a soft cloth or a gentle stream of water to restore photosynthesis.

3 Apply a fungicide spray to prevent the spread of the sooty mold fungus on the plant's foliage.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

warning

Mealybugs

These insects produce a white, waxy coating and excrete honeydew that creates a sticky residue on the foliage of mature rhododendrons.

Common

lightbulb

How to confirm: Search for small, cottony white masses nestled in the leaf axils or where the leaf meets the stem.

build How to fix it

shopping_cart Recommended Products

1 Treat the plant with an organic insecticide to eliminate the mealybug population and remove the white, waxy coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Wipe the sticky residue off the leaves using a soft cloth dampened with water or insecticidal soap to prevent fungal growth.

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

Rhododendron arboreum – Sticky Leaves

search Possible Causes

Scale Insects

Aphid Infestation

Sooty Mold

Mealybugs

Other Rhododendron arboreum problems

Measuring System

Rhododendron arboreum – Sticky Leaves

search Possible Causes

Scale Insects

Aphid Infestation

Sooty Mold

Mealybugs

Other Rhododendron arboreum problems