Globe Willow Frothy Flux: Oozing, Blackened Bark, and Wasps

What Is Frothy Flux?

Your 3-year-old globe willow’s white foam, blackening trunk, and wasp visitors are classic signs of frothy flux—a fermentation of cambial tissue by yeast or other saprophytic organisms that enter through wounds (freeze cracks, pruning cuts, mower damage). Unlike bacterial wetwood (slime flux) of elms and ashes, frothy flux stays in the outer cambial layers.

Can the Tree Be Saved?

Larger, vigorous willows often outgrow the problem. On a young tree, the disease can kill the cambium and lead to death within a few years. There is no spray that stops the ooze.

Surgical Option (If Infection Is Limited)

1. Mix 10% bleach solution (1 part bleach : 9 parts water).
2. With a sharp, sterile knife, cut away all discolored, infected bark down to hard wood. Dip the blade in bleach after every cut.
3. Soak the cleaned wound with the bleach solution.
4. Leave the wound open—no paint, wrap, or sealant. Dry air promotes healing.
5. Never remove more than half the bark circumference on any stem; if you must, remove the entire branch instead.

Cultural Care to Boost Vigor

• Water deeply but infrequently—let the soil dry several inches down between soakings.
• Fertilize moderately in spring (e.g., a balanced formula or lawn fertilizer high in nitrogen). Avoid over-fertilizing, which creates weak, disease-prone growth.

With good care, willows and frothy flux can coexist for years, the disease waxing and waning.