Bacterial Blotch (Pseudomonas)

Yellow-to-brown slimy or sunken patches on caps; a wet, off smell.

Likely causes

• Surfaces staying wet
• Water sitting on caps
• Too little fresh air

What to do

Lower humidity a touch, increase airflow, and stop misting directly onto pins and caps.

Easily confused with

• Wet Spot / Sour Rot (Bacillus)

Not sure?

Walk through the troubleshooting guide, ask the AI Grow Consultant, or check the conditions your species needs on its species page.

This entry is general growing guidance compiled from extension and trade practice; it has no single citation yet. Treat it as a starting point.

Last updated: 2026-10-19