Acer Fine Webbing - Causes & Fixes

Jump to cause: Spider Mites (Tetranychidae) Two-Spotted Spider Mites (Tetranychus urticae) Spotted Tent Caterpillar

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Spider Mites (Tetranychidae)

Spider mites are the most common cause of fine webbing on Acer species, especially during hot, dry periods. They feed on the undersides of leaves, causing stippling and leaving behind silk webs as they migrate.

Very Common

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

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1 Apply an organic insecticide to eliminate existing spider mite populations, eggs, and larvae.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Increase humidity around the Acer by misting the leaves regularly, as spider mites thrive in hot, dry conditions.

Flora Premium Plant Mister

Spray Bottles

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3 Thoroughly spray the undersides of the leaves with water to physically dislodge webbing and mites from the foliage.

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Two-Spotted Spider Mites (Tetranychus urticae)

A specific subset of spider mites that thrives in microclimates with low humidity, often found on maple saplings or shaded Acer leaves. The webbing becomes more dense as the population grows and environmental stress increases.

Very Common

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How to confirm: Inspect the undersides of leaves for tiny yellow spots (stippling) accompanied by fine silk threads.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the spider mite population and destroy eggs, larvae, and adults.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Increase ambient humidity around the Acer to make the microclimate less hospitable for mite reproduction.

Flora Premium Plant Mister

Spray Bottles

$12

In Stock

3 Regularly inspect the undersides of leaves and wipe them with a damp cloth to physically remove webbing and mites.

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Spotted Tent Caterpillar

While primarily known for larger silken nests, early instar larvae can produce fine webbing along leaf edges or stems of Acer. These caterpillars consume the leaf tissue, leaving behind irregular holes.

Common

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How to confirm: Look for small, dark caterpillars moving within the webbing or visible leaf consumption patterns.

build How to fix it

shopping_cart Recommended Products

1 Manually remove any visible caterpillar nests or larvae from the branches and dispose of them in a sealed bag to prevent further spread.

2 Apply an organic insecticide spray to the affected areas to target any remaining larvae and protect new growth.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Prune away heavily defoliated branches using clean, sharp shears to reduce the caterpillar's food source and improve airflow.