Describe the change
Abnormal scarred or discoloured areas in the colonised substrate.
Fungal diseases
Wood-ear mycelial scar disease
This is primarily a disease pattern in the growing substrate/mycelium, not simply a mark on a harvested wood-ear fruit body.
Organism / cause: Scytalidium auriculariicola; some older reports used S. lignicola
Where this evidence applies: Published Auricularia research from China; check the actual species and strain being grown.
Picture → observation → next check
A visual guide to your observations
- Casing layer
For crops that use casing, trace storage, handling and the casing lot separately from the compost.
- Compost below
Compare the compost lot and preparation history. White growth is not, by itself, proof of either purity or contamination.
- Straw bag
Record treatment, cooling, spawning and the first affected position through the intact bag.
- Wood-substrate block
Check the filter, seal and batch history without opening suspect material. Normal block appearance depends on crop and stage.
Keep another explanation open
Bag injury, wet substrate and unrelated competitors.
Collect one useful piece of evidence
Record exact Auricularia identity, batch and substrate recipe.
A visual match is only a starting point. Specialist identification is important because historical reports used a different Scytalidium name.
01 · Observe
What you may see
- Abnormal scarred or discoloured areas in the colonised substrate.
- Interrupted crop growth associated with affected patches.
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
- Bag injury, wet substrate and unrelated competitors.
- Natural pigment or substrate colour without progressive damage.
How it may arise or move
The reported organism colonises the production substrate. A farm investigation should trace blocks, spawn and handling rather than assuming airborne origin.
03 · Check
Collect evidence before changing the crop
- Record exact Auricularia identity, batch and substrate recipe.
- Compare affected blocks with controls from the same spawn lot.
What confirmation needs: Specialist identification is important because historical reports used a different Scytalidium name.
Use the field record and sampling checklist →04 · Respond
What to do next
- Keep affected blocks traceable and avoid opening them in clean production.
- Send the laboratory the full block history, not only a fruit-body photograph.
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
- Protect spawn and treated substrate from cross-contamination.
- Keep records that distinguish strain behaviour from a newly introduced contaminant.
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
Taxonomic and pathogenicity research; regional report, not a prevalence estimate for India.
- Characterization of the mitochondrial genome of Scytalidium auriculariicola ↗
Scientific Reports · 2019
Used for: Revised identity of the slippery-scar pathogen; earlier reports used S. lignicola.
Limit: Taxonomy has changed. A scar requires laboratory examination, not identification by colour.
Compare related explanations
Fungal diseases
Wood-ear brown rot
A reported Trichoderma-associated rot needs to be separated from natural wood-ear pigmentation, drying and general spoilage.
Confirmed in a particular A. cornea production study; not every brown Auricularia is diseased.
Signs, checks & response →Viruses & culture health
Spawn failure and stalled colonisation
Separate three questions: was the spawn viable, was the substrate suitable, and was the inoculation/handling process sound?
Applies from grain spawn to compost, straw and supplemented wood substrates.
Signs, checks & response →