Rhododendron concinnum Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are common pests on Rhododendrons that pierce the leaf tissue to suck out sap, excreting a sugary substance known as honeydew. This residue creates a noticeable sticky film on the leaf surfaces.

Very Common

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How to confirm: Inspect the undersides of new growth and leaf buds for tiny, soft-bodied insects or clusters of eggs.

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

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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.

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Scale Insects

Scale insects attach themselves to the stems and leaves of Rhododendron concinnum, feeding on plant fluids and producing honeydew as a byproduct. Unlike aphids, these pests often appear as stationary, waxy bumps.

Very Common

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How to confirm: Look for small, hard, scale-like bumps on the stems or leaf petioles that do not move when disturbed.

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1 Apply an organic insecticide spray to the plant to eliminate the scale insects and their eggs.

Bonide Captain Jack's Neem Oil 32 oz

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2 Physically remove visible scale bumps from stems and leaves using a soft cloth or cotton swab dipped in rubbing alcohol.

3 Wipe away the sticky honeydew residue from the leaves to prevent the growth of sooty mold.

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Whitefly Infestation

Whiteflies congregate on the undersides of Rhododendron leaves; their feeding activity results in sticky honeydew coating the foliage. This can often lead to secondary issues like sooty mold growth.

Common

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How to confirm: Gently shake a branch over a white sheet to see if tiny white insects fly upward.

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1 Apply an organic insecticide spray to the undersides of the leaves to eliminate adult whiteflies and larvae.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Use yellow sticky traps near the foliage to capture flying adults and monitor the infestation level.

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3 Gently wipe the sticky honeydew and any secondary sooty mold from the leaves using a soft cloth and water.

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Sooty Mold (Secondary Symptom)

While not the primary cause of stickiness, sooty mold is a black fungus that grows specifically on the honeydew left by piercing-sucking insects. It can make the leaves appear dirty or coated in dark soot.

Common

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How to confirm: Check if the sticky residue is accompanied by a dark, powdery, black layer that can be wiped off.

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shopping_cart Recommended Products

1 Identify and treat the underlying insect pests, such as aphids or scale, 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 leaves with water or a mild soap solution to remove the black sooty mold residue and restore photosynthesis.