Acer griseum Fine Webbing - Causes & Fixes

Jump to cause: Spider Mites (Tetranychidae) Spotted Tentiform Leafminer (Phyllonorycter blancardella) Fall Webworm (Macaria nostra)

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Spider Mites (Tetranychidae)

These tiny arachnids thrive in hot, dry conditions and feed on the sap of Acer griseum leaves, leaving characteristic fine silken webbing across the foliage. The feeding causes stippling (small white/yellow dots) on the leaf surface.

Very Common

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How to confirm: Tap a leaf over a white piece of paper; if tiny moving specks fall off, you have spider mites.

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

Bonide Captain Jack's Neem Oil 32 oz

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2 Increase humidity around the foliage and ensure the plant is well-hydrated to make the environment less hospitable for mites.

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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 maple.

Fiskars 5/8" Bypass Pruning Shears

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Spotted Tentiform Leafminer (Phyllonorycter blancardella)

The larvae of these moths create small, blotchy mines within the leaf tissue which can sometimes be accompanied by silk-like structures or folded leaf edges. This is common in various Acer species during the growing season.

Common

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How to confirm: Examine the leaves for small, pale, tent-like bumps or translucent patches where the leaf texture has changed.

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shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the larvae and prevent further leaf mining damage.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Prune and carefully dispose of heavily infested leaves to remove the silk-like structures and larvae from the tree.

3 Monitor the tree regularly using a magnifying glass to catch new blotchy mines before they spread.

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Fall Webworm (Macaria nostra)

While more common in other deciduous trees, these caterpillars construct large, dense silk webs that enclose clusters of leaves to protect themselves while feeding. This results in much heavier, structural webbing than spider mites.

Common

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How to confirm: Check if the webbing is concentrated in large, thick-walled 'tents' rather than a fine, delicate mist across the whole leaf surface.

build How to fix it

shopping_cart Recommended Products

1 Manually remove the silk webs and caterpillars from the tree branches to prevent further defoliation.

2 Apply an organic insecticide spray to the affected areas to target any remaining larvae or eggs.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Monitor the tree closely for new webbing and use a targeted spray if the infestation persists.