Describe the change
Visible cap droplets or persistent wet surfaces.
Environmental disorders
Condensation, wet caps, dry edges and cracking
Room humidity does not tell the whole water story. A crop can have wet caps in one rack zone and drying injury in another.
Organism / cause: Water balance and surface conditions; infection may occur secondarily
Where this evidence applies: All production systems, with different crop-specific tolerances.
Picture → observation → next check
A visual guide to your observations
- Surface water
Record watering time, condensation and how long caps remain wet. Room relative humidity alone does not describe cap wetness.
- Drying and cracking
Check where damage occurs and when it appeared. Compare airflow, water supply and maturity with a same-strain crop.
Keep another explanation open
Blotch, ageing, soft rot and mechanical injury.
Collect one useful piece of evidence
Compare watering time, cap wetness, air movement and temperature changes.
A visual match is only a starting point. Environmental records help; growing lesions or decay may still need laboratory examination.
01 · Observe
What you may see
- Visible cap droplets or persistent wet surfaces.
- Cracks, dry edges, shrivelling or uneven surface drying.
No verified reusable diagnostic photograph is included for this entry. The illustration above explains observation context, not a confirmed disease specimen. Consult the original source figures where available.
02 · Compare
What can look similar
- Blotch, ageing, soft rot and mechanical injury.
How it may arise or move
Shared air/water conditions create a spatial pattern; wetness can also favour some bacterial diseases.
03 · Check
Collect evidence before changing the crop
- Compare watering time, cap wetness, air movement and temperature changes.
- Inspect near fans, doors, walls and upper shelves separately.
What confirmation needs: Environmental records help; growing lesions or decay may still need laboratory examination.
Use the field record and sampling checklist →04 · Respond
What to do next
- Address leaks, condensation or direct drying drafts without shocking the crop.
- Investigate lesions that continue after the environment is corrected.
These are investigation and containment steps, not a guaranteed cure. Do not eat, sell or distribute suspect material on the strength of a visual match. Do not culture unknown contaminants or experiment with pesticides in a growing room.
05 · Learn
Reduce recurrence
- Maintain an even crop environment and an appropriate watering plan.
- Verify sensor location and actual crop surfaces rather than relying on one dashboard value.
After intervention, compare new affected units, crop condition and inspection results against the same recorded baseline. A lack of visible growth does not, by itself, verify decontamination or food safety.
Read the stage-by-stage prevention plan →Evidence & sources
Cultivation and blotch guidance; no one relative-humidity target fits all species and stages.
- Seven Stages of Cultivation ↗
Cornell Small Farms · Undated guide
Used for: Indoor cultivation stages, ventilation, moisture and crop-specific conditions.
Limit: Environmental needs depend on species and strain; no single climate setpoint fits all crops.
- Bacterial Blotch Disease ↗
Penn State Extension · Updated 23 December 2025
Used for: Wet caps, condensation, symptom patterns and prevention.
Limit: Foreign water-treatment or crop-protection rates are not Indian recommendations.
Compare related explanations
Bacterial diseases
Brown bacterial blotch in button mushrooms
Persistent surface wetness can favour bacterial blotch. Managing cap drying means balancing the crop environment, not simply drying the entire room.
Agaricus caps; a brown spot does not establish bacterial identity.
Signs, checks & response →Bacterial diseases
Brown blotch in oyster mushrooms
Blotching in oyster needs its own host context. Different strains reacted differently to a controlled bacterial challenge.
Detailed evidence here concerns tested P. ostreatus, P. pulmonarius and P. cf. floridanus strains. King oyster is a differential, not a claim that this trial tested it.
Signs, checks & response →Bacterial diseases
Bacterial soft rot and tissue collapse
Wet, collapsing tissue is a reason to separate produce and investigate timing. It can be a primary infection or secondary decay after injury.
Symptom differential. The cited Burkholderia evidence includes Agaricus bitorquis; it is not the cause of every soft rot on this crop list.
Signs, checks & response →