Rhododendron calendulaceum Sticky Leaves - Causes & Fixes

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Aphid Infestation

Aphids are small, soft-bodied insects that pierce the tender new growth of Flame Azaleas to suck sap, excreting a sugary substance known as honeydew. This residue creates a characteristic sticky film on the leaf surfaces.

Very Common

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

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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 wash the sticky residue off the leaves using a soft cloth or a gentle stream of water to prevent fungal growth.

3 Inspect the undersides of new growth regularly and use yellow sticky traps to monitor for any returning pests.

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Scale Insects

Scale insects attach themselves to the stems and leaves of Rhododendrons, feeding on phloem sap and producing honeydew. This can lead to a sticky coating that may eventually host sooty mold.

Common

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How to confirm: Look for small, stationary bumps or bumps that resemble scale armor on the stems or leaf petioles.

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shopping_cart Recommended Products

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

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

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

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

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Sooty Mold

While not a direct cause of stickiness, sooty mold is a black fungus that grows specifically on the honeydew left behind by sap-sucking insects. It often appears as a dark, powdery coating over the sticky residue.

Common

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How to confirm: Check if the sticky substance is accompanied by a black, velvety layer that can be wiped off the leaves.

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1 Identify and treat the underlying sap-sucking insects, 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 leaves with a soft cloth or a mild insecticidal soap spray to remove the black sooty mold and sticky residue from the foliage.

Bonide Captain Jack's Insecticidal Super Soap 32 oz

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3 Monitor the plant's environment and soil moisture to ensure the plant is not under stress, which can make it more susceptible to pest infestations.

GROWIT Soil Moisture Meter - Blue

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Whiteflies

These tiny flying insects congregate on the undersides of Flame Azalea foliage, feeding on sap and leaving behind sticky honeydew. They are often noticed when the plant is disturbed.

Common

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How to confirm: Gently shake a branch over a white surface to see if small, white winged insects emerge.

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 Deploy yellow sticky traps around the plant to capture adult whiteflies and monitor the severity of the infestation.

Super Ninja Fungus Gnat Traps - 30 Pack