Mystery Blob at Mulberry Base: Fungus or Harmless Slime Mold?

Is That Spongy Growth Killing Your Fruitless Mulberry?

A pale, spongy, 6×3-inch blob at the base of your mulberry could be either a serious basal rot fungus or the harmless “Dog Vomit” slime mold (Fuligo septica) common on wood mulch. Basal rot indicates internal decay and potential structural risk; Dog Vomit is just gross but benign.

Next Step

Hire a Certified Arborist to inspect. They can distinguish between a pathogenic wood-decay fungus and a harmless slime mold, and advise on tree safety. Given the tree’s proximity to your house, professional assessment is worth the cost.