Acer truncatum Fine Webbing - Causes & Fixes

Jump to cause: Two-Spotted Spider Mite Infestation Maple Leafminer (Phyllonorycter acerivora) Fall Webworm (Hyphantria cunea)

search Possible Causes

error

Two-Spotted Spider Mite Infestation

Spider mites are the most common cause of fine webbing on Acer species, especially during hot, dry periods. They pierce the leaf cells to suck out contents, leaving behind tiny white dots and characteristic silk webs.

Very Common

lightbulb

How to confirm: Hold a white piece of paper under a leaf and tap it sharply 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 to eliminate the spider mite population and destroy eggs/larvae.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Increase humidity around the maple by misting the foliage or using a pebble tray to create an environment unfavorable to mites.

Bleuhome 6-Pack 6in Plant Saucers Black

Pot Saucers

$6

In Stock

3 Gently wash the leaves with a strong stream of water to physically dislodge webbing and mites from the undersides of the foliage.

warning

Maple Leafminer (Phyllonorycter acerivora)

While primarily known for creating blotch mines, heavy larvae populations can produce fine silk structures and webbing within the leaf tissue or around edges as they pupate.

Common

lightbulb

How to confirm: Inspect the underside of leaves for small, translucent blotches that look like the leaf tissue has been hollowed out.

build How to fix it

shopping_cart Recommended Products

1 Inspect the undersides of leaves for active larvae or pupating silk and prune away heavily infested leaves to prevent further spread.

2 Apply an organic insecticide spray to the foliage to target larvae and disrupt the life cycle of the leafminer.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

3 Monitor the tree's health and ensure it is not under environmental stress, which can make it more susceptible to infestations.

FoxFarm Bush Doctor Boomerang Liquid Plant Fertilizer 1 Pint

0.5 L • 1 pcs

$20

In Stock

warning

Fall Webworm (Hyphantria cunea)

Though more common in summer, these caterpillars construct large, dense silk webs that can appear as fine or heavy webbing covering clusters of Bunge Maple leaves.

Common

lightbulb

How to confirm: Look for larger, more concentrated nests of silk and check for visible green caterpillars within the webbing.

build How to fix it

shopping_cart Recommended Products

1 Manually remove and destroy the silk webs and any visible 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.