Acer glabrum Fine Webbing - Causes & Fixes

Jump to cause: Two-Spotted Spider Mite Infestation Spider Mite Mites (Tetranychus urticae) Fall Webworm (Macaria species)

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Two-Spotted Spider Mite Infestation

These microscopic arachnids thrive in warm, dry conditions and feed on the sap of Acer glabrum leaves. Their feeding creates characteristic fine silken webs across the leaf undersides and stems, often accompanied by stippling (tiny white spots) on the foliage.

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 crawling specks fall onto the paper.

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shopping_cart Recommended Products

1 Apply an organic miticide or insecticide 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 consistently moist, as spider mites thrive in dry environments.

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3 Physically remove visible webbing and infested leaves by wiping them with a damp cloth or pruning them away if heavily damaged.

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Spider Mite Mites (Tetranychus urticae)

A specific subset of spider mites that can cause heavy webbing during periods of heat stress in Rocky Mountain Maples. The webs act as a protective microclimate for the mites, but they eventually lead to premature leaf drop and bronzing.

Very Common

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How to confirm: Inspect the undersides of the leaves specifically for small, pale dots or clusters of eggs near the veins.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic miticide to eliminate the spider mite population and destroy the protective webbing.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Increase local humidity and reduce heat stress by misting the foliage regularly or using a pebble tray.

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3 Monitor soil moisture levels to ensure the plant is not experiencing drought-induced stress, which attracts mites.

GROWIT Soil Moisture Meter - Blue

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Fall Webworm (Macaria species)

While more common in certain regions, these caterpillars construct dense, silken nests on deciduous trees like Acer glabrum. Unlike spider mites, the webbing will be much thicker and contain visible green larvae consuming the leaf edges.

Common

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How to confirm: Gently pull at the web structure to check for the presence of small, caterpillar-like larvae inside.

build How to fix it

shopping_cart Recommended Products

1 Manually remove the dense silk nests by pruning the affected branches or hand-picking the visible green larvae from the webbing.

2 Apply an organic insecticide spray to the tree to target any remaining larvae and prevent further nest construction.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Monitor the tree regularly for new webbing or larvae, especially during the late spring and summer months.