Rhododendron mucronatum Fine Webbing - Causes & Fixes

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Spider Mites (Tetranychidae)

The presence of fine webbing is a classic indicator of spider mite infestation, which thrives in the warm, dry conditions that R. mucronatum often experiences during summer. These tiny arachnids pierce plant cells to suck out sap, leading to stippling and eventual leaf drop.

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 specks fall onto the paper.

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

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2 Increase humidity around the plant and ensure the soil remains moist, as spider mites thrive in hot, dry environments.

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

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Two-Spotted Spider Mite (Tetranychus urticae)

This specific species is highly prevalent on Rhododendron species and creates dense silk webs to protect their eggs and colonies. As the population grows, the webbing can cover entire leaf clusters, making the plant look dusty or coated in silk.

Very Common

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How to confirm: Inspect the undersides of the leaves for small, moving yellowish dots or tiny white egg sacs.

build How to fix it

shopping_cart Recommended Products

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

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Increase humidity around the plant by using a fine mist spray, as spider mites thrive in dry conditions.

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3 Gently wipe the leaves with a damp cloth to physically remove the silk webbing and any remaining mite colonies.

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Cheesemite (Philotragus spp.)

While less common than true spider mites, certain micro-moths or related pests can produce silken threads around new growth or leaf edges in Rhododendrons. This webbing is often more localized to terminal buds rather than spread across the entire leaf surface.

Common

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How to confirm: Check if the webbing is concentrated specifically around the newest, softest growth at the tips of the branches.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the affected terminal buds and new growth to eliminate the larvae and any remaining webbing.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Prune away any heavily infested terminal buds or leaves to prevent the micro-moths from spreading to healthy parts of the plant.

Fiskars 5/8" Bypass Pruning Shears