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Japanese Maple White Tendrils: Ambrosia Beetle Toothpicks, Not Mold

Diagnosis: Ambrosia Beetle

Thin white "tendrils" on branches/trunk = frass toothpicks from ambrosia beetles boring into thin bark. Not a disease.

Confirmation

Remove a tendril—look for tiny entrance hole at base. Google "ambrosia beetle toothpicks" for images.

Management

Heavily infested small trees often die.
Prevent: keep tree vigorous (water, mulch, no wounds).
Pyrethroid spray on trunk in early spring may deter.

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