Rhododendron calendulaceum Fine Webbing - Causes & Fixes

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Two-Spotted Spider Mite (Tetranychus urticae)

These microscopic arachnids feed on the underside of Flame Azalea leaves, injecting toxins that cause stippling and produce characteristic fine silk webbing as they spin webs for protection. They thrive in hot, dry conditions which are often stressful for Rhododendrons.

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 fall onto the paper.

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1 Apply an organic insecticide/miticide spray to the plant, ensuring you thoroughly coat the undersides of the leaves where the mites reside.

Bonide Captain Jack's Neem Oil 32 oz

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2 Increase local humidity and reduce heat stress by misting the foliage regularly or using a pebble tray to create a more hospitable environment for the Rhododendron.

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3 Monitor soil moisture levels closely to ensure the plant remains hydrated, as dry conditions accelerate spider mite infestations.

GROWIT Soil Moisture Meter - Blue

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Edermyran Spider Mites

Specific species of mite can inhabit the dense foliage of R. calendulaceum, creating more localized, dense webbing around new growth and flower buds. This can lead to premature leaf drop and reduced flowering vigor.

Common

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How to confirm: Inspect the undersides of the newest, most tender leaves for concentrated clusters of webbing or small orange/yellow dots.

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shopping_cart Recommended Products

1 Apply an organic miticide to eliminate the spider mite population and destroy eggs/larvae on the foliage.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Prune away heavily infested new growth and flower buds to prevent the mites from spreading to healthy parts of the plant.

Fiskars 5/8" Bypass Pruning Shears

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3 Increase humidity around the plant by misting the leaves, as spider mites thrive in dry conditions.

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Fall Webworm (Macaria nostra)

While more commonly associated with larger deciduous trees, certain lepidopteran larvae can create dense silk webs on woody shrubs. These webs are much thicker and more structural than the fine, disorganized webbing of mites.

Common

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How to confirm: Check if the webbing is concentrated in thick, opaque-looking nests rather than a light, shimmering veil over the leaf surface.

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shopping_cart Recommended Products

1 Manually remove the dense silk webs and any visible larvae from the shrub using gloved hands or a pruning shear to reduce the immediate infestation.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

2 Apply an organic insecticide spray to the plant to target any remaining larvae and prevent further webbing formation.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Prune away heavily infested branches to prevent the webs from spreading to healthy parts of the Flame Azalea.