Rhododendron minus Fine Webbing - Causes & Fixes

search Possible Causes

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Spider Mites (Tetranychidae)

Spider mites thrive in the warm, dry conditions often experienced by dwarf rhododendrons. They pierce the leaf cells to feed on sap, leaving behind fine silk webbing and causing stippling (tiny white/yellow dots) on the foliage.

Very Common

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How to confirm: Hold a white piece of paper under a leaf and tap it to see if tiny crawling specks fall onto the paper.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic miticide or insecticide spray to the plant to eliminate existing spider mite populations and destroy eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

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

PlanKKers Terracotta Watering Spikes (Set 6)

Terracotta

$17

In Stock

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

Cutting Tools

$13

In Stock

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Thrips Infestation

While thrips are more known for scarring, heavy infestations can produce silk-like threads or fine debris wrapped in webbing. They feed on the tender new growth of Rhododendron minus, causing leaves to appear distorted or blackened.

Common

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How to confirm: Inspect the undersides of new, unfolding leaves for very small, slender, yellowish or dark insects.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the plant to eliminate active thrips larvae and adults.

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 blackened new growth to reduce the pest population and prevent further spread.

3 Monitor the plant closely using yellow sticky traps to capture emerging adults and track infestation levels.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

In Stock

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High Humidity/Mould Growth (Secondary)

In extremely stagnant, humid environments, certain fungal hyphae can appear as fine, hair-like structures on the leaf surface. This is often accompanied by leaf spotting or rot if air circulation around the dwarf shrub is poor.

Common

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How to confirm: Check if the 'webbing' is actually fuzzy growth attached to specific dark spots on the leaves rather than a network spanning multiple leaves.

build How to fix it

shopping_cart Recommended Products

1 Improve air circulation around the plant by spacing it away from other foliage and using a small fan to prevent stagnant, humid pockets.

2 Apply a fungicide to treat the fungal hyphae and prevent further spread of mold or rot.