Rhododendron prunifolium Fine Webbing - Causes & Fixes

Jump to cause: Spider Mites (Tetranychidae) Astigmatid Mites (Grain Mites) Scale Insects (Emergent Stages)

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Spider Mites (Tetranychidae)

Spider mites thrive in the warm, dry conditions that often affect Plum-leaf Azaleas. They pierce the leaf cells to suck out nutrients, leaving behind fine silk webbing and stippled white or yellow spots on the foliage.

Very Common

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How to confirm: Hold a white piece of paper under a leaf and tap the leaf sharply to see if tiny crawling specks drop onto the paper.

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1 Apply an organic insecticide/miticide spray to the plant to eliminate existing spider mite populations and destroy eggs.

Bonide Captain Jack's Neem Oil 32 oz

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2 Increase humidity around the foliage and ensure the plant is not in overly dry conditions, as spider mites thrive in arid environments.

3 Prune and dispose of heavily infested or dead leaves to prevent the mites from spreading to healthy parts of the plant.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

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Astigmatid Mites (Grain Mites)

These microscopic mites inhabit the leaf litter and soil around the base of the Rhododendron. While they typically feed on organic matter, heavy infestations can create a visible web-like structure in the debris near the plant.

Common

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How to confirm: Examine the leaf litter at the base of the plant for movement or a silken texture in the decaying mulch.

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1 Remove and dispose of all leaf litter and organic debris from the base of the plant to eliminate mite habitats.

2 Apply an organic miticide spray to the soil surface and surrounding area to target any remaining mites.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Maintain a clean environment by regularly clearing away fallen leaves to prevent future infestations.

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Scale Insects (Emergent Stages)

While scale typically produces hard bumps, certain immature stages or secondary fungal growths associated with scale can create a messy, web-like appearance on the undersides of azalea leaves.

Common

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How to confirm: Inspect the stems and leaf petioles for small, stationary, waxy bumps that cannot be easily wiped off.

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shopping_cart Recommended Products

1 Apply an organic insecticide spray to the undersides of the leaves to eliminate immature scale insects and disrupt their life cycle.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Inspect the plant regularly and use a soft cloth to wipe away any visible webbing or scale clusters to prevent further infestation.

3 Ensure the plant is in an area with good airflow to reduce the humidity that supports secondary fungal growth.