Rhododendron decorum Fine Webbing - Causes & Fixes

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Spider Mites (Tetranychidae)

The fine webbing is a classic sign of spider mite infestations, which thrive in the warm, dry conditions often experienced by Rhododendrons. These tiny arachnids pierce the leaf cells to suck out nutrients, leaving behind stippled patterns and silk webs.

Very Common

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How to confirm: Hold a white piece of paper underneath a leaf and tap it sharply to see if tiny moving specks drop off.

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1 Apply an organic insecticide spray to eliminate existing spider mites, larvae, and eggs on the plant foliage.

Bonide Captain Jack's Neem Oil 32 oz

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2 Increase humidity around the plant and avoid dry, warm air to make the environment less hospitable for future mite outbreaks.

Flora Premium Plant Mister

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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 Rhododendron.

Fiskars 5/8" Bypass Pruning Shears

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Broad Mites

While they do not produce large visible webs, broad mites can cause leaf distortion and fine silk-like appearances during heavy infestations. In Rhododendrons, this often manifests as thickened, puckered, or 'bronzed' new growth.

Common

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How to confirm: Examine the youngest, most tender leaves at the tips of the branches for swelling or abnormal curling.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic miticide to eliminate the mite population and prevent further leaf distortion.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Prune and dispose of heavily distorted or 'bronzed' new growth to reduce the mite reservoir.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

3 Monitor the plant regularly using a magnifying glass to check for new webbing or puckered leaves.

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Thrips

Thrips can create a silken appearance through their feeding habits and frass (waste) accumulation. In Rhododendron species, this is often accompanied by silvery streaks or dark necrotic spots on the leaf surface.

Common

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How to confirm: Look for very small, slender insects moving rapidly along the underside of the leaves.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate existing thrips larvae and adults, and to prevent further feeding damage.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Inspect the undersides of leaves and surrounding foliage for more webbing or pests, and use yellow sticky traps to monitor and capture flying adults.