Rhododendron keleticum Fine Webbing - Causes & Fixes

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Spider Mites (Tetranychidae)

The presence of fine, silky webbing on the undersides of Rhododendron leaves is a classic sign of spider mite infestation. These arachnids pierce plant cells to feed on sap, causing stippling and eventual leaf drop in Keleti rhododendrons.

Very Common

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How to confirm: Hold a white piece of paper underneath a leaf and tap the leaf sharply to see if tiny moving dots fall onto the paper.

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shopping_cart Recommended Products

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

Bonide Captain Jack's Neem Oil 32 oz

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2 Increase humidity around the plant by misting the foliage regularly, as spider mites thrive in dry conditions.

Flora Premium Plant Mister

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

Fiskars 5/8" Bypass Pruning Shears

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Broad Mites ( Eriophyidae)

While they do not produce large webs, broad mites can cause leaf distortion and a fine, dust-like appearance that might be mistaken for webbing. They thrive in the humid microclimates often found within dense Rhododendron foliage.

Common

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How to confirm: Examine new growth for curling, thickened, or distorted leaves without visible spider tracks.

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shopping_cart Recommended Products

1 Apply an organic miticide or insecticide spray to the foliage to eliminate the mite population and control further leaf distortion.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Prune away and carefully dispose of heavily distorted or infested leaves to reduce the mite's breeding habitat within the dense foliage.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

3 Improve airflow around the plant by thinning out dense branches, which helps disrupt the humid microclimates that broad mites prefer.

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High Humidity and Fungal Mycelium

In extremely stagnant, humid conditions, certain fungal species can produce a fine, white, web-like mycelium on the leaf surface. This is often accompanied by soft rot or spotting on the Rhododendron leaves.

Common

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How to confirm: Check if the 'webbing' is actually part of the leaf tissue or if it can be wiped away easily with a damp cloth.

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shopping_cart Recommended Products

1 Apply a fungicide to eliminate the fungal mycelium and prevent the spread of soft rot.