Rhododendron degronianum Fine Webbing - Causes & Fixes

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Two-Spotted Spider Mite (Tetranychus urticae)

These arachnids thrive in warm, dry conditions and feed on the undersides of Rhododendron leaves, piercing cells and injecting toxin. The fine webbing is a defensive structure created by the mites to protect their eggs and colonies.

Very Common

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How to confirm: Tap a leaf over a white piece of paper to see if tiny crawling specks fall out.

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shopping_cart Recommended Products

1 Apply an organic miticide or insecticide 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

0.9 L • 1 pcs • Organic

$10

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2 Increase local humidity and reduce heat by misting the foliage regularly, as spider mites thrive in dry environments.

Flora Premium Plant Mister

Spray Bottles

$12

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3 Prune and dispose of heavily infested leaves to prevent the mite population from spreading to other plants.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

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Spider Mites (Tenuipalpus species)

While less destructive than the Two-Spotted variety, eriophyid mites can cause subtle stippling and fine silk production on azalea foliage. They often appear during periods of low humidity in the Yakushima microclimate.

Common

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How to confirm: Use a hand lens to inspect the leaf margins for extremely minute, slow-moving organisms.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic miticide or insecticide to eliminate the mite population and destroy any remaining eggs or larvae.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Increase ambient humidity around the plant to make the environment less hospitable for spider mite development.

Flora Premium Plant Mister

Spray Bottles

$12

In Stock

3 Gently wipe the foliage with a damp cloth to physically remove fine webbing and any visible mites from the leaves.

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Webbing Mites (Various Eriophyidae)

Certain eriophyid mites create much finer, almost invisible silken patches on the leaf surface or buds. This can lead to localized discoloration or leaf distortion in Rhododendron species.

Common

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How to confirm: Check if the webbing is concentrated specifically around the new growth or terminal buds.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic miticide or insecticide spray to the plant to eliminate the mites and their eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Prune and dispose of any heavily distorted or infested buds and leaves to prevent the mites from spreading to healthy tissue.

Fiskars 5/8" Bypass Pruning Shears