Describe the change
White/brown plaster-like colonies, olive growth or pink/red patches.
Competitor moulds
Plaster, olive, lipstick, cinnamon and ink-cap competitors
Old farm manuals use colour and texture names. They are useful search terms, but a visible colony rarely supports a species-level diagnosis.
Organism / cause: Historical descriptive groups; see the identification register on the Sources & limits page
Where this evidence applies: A historical-name register, not proof that every organism occurs on every listed crop.
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
Normal crop mycelium, pigmented metabolites and unrelated moulds.
Collect one useful piece of evidence
Record colour under neutral light and where the colony starts.
A visual match is only a starting point. Macroscopic names are preliminary. A qualified laboratory may need microscopy or sequencing to identify the organism.
01 · Observe
What you may see
- White/brown plaster-like colonies, olive growth or pink/red patches.
- Cup-like competitors or ink-cap-type fruit bodies appearing instead of the intended crop.
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
- Normal crop mycelium, pigmented metabolites and unrelated moulds.
How it may arise or move
Competitors exploit available substrate; process failure and contamination after treatment must be examined separately.
03 · Check
Collect evidence before changing the crop
- Record colour under neutral light and where the colony starts.
- Check the original substrate formulation and actual treatment record.
What confirmation needs: Macroscopic names are preliminary. A qualified laboratory may need microscopy or sequencing to identify the organism.
Use the field record and sampling checklist →04 · Respond
What to do next
- Photograph without disturbing spores; isolate the observation from food-safety assumptions.
- Use the register to discuss testing, not to choose a spray.
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
- Validate the crop-specific substrate process.
- Keep cooling, spawning, casing and waste-handling tools separated.
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
Historic Indian manual used for names only; minor competitors have less current host-specific evidence.
- Diseases and Competitor Moulds of Mushrooms and their Management ↗
ICAR–National Research Centre for Mushroom, Solan (now DMR) · 2007
Used for: Historical Indian register of competitor names and abiotic disorders; printed pages 2–43 and 65–69.
Limit: Older names and treatments. Used as a coverage checklist, not a current pesticide label or an image-reuse licence.
- Cultivation Technology of Paddy Straw Mushroom ↗
ICAR–DMR Solan · Historical technical bulletin
Used for: Volvariella cultivation, competitors and crop-specific handling.
Limit: Do not transfer button-mushroom climate, cold-storage or chemical recipes to this warm-growing species.
Compare related explanations
Competitor moulds
Fast-spreading orange mould
Rapidly spreading orange growth is an operational contamination problem. A history of food use for selected Neurospora strains does not make an unknown colony safe.
Generic substrate-contamination differential; not a confirmed disease report for every crop listed.
Signs, checks & response →Competitor moulds
Aspergillus, Penicillium and unidentified green moulds
Green, blue-green or dark growth is not automatically Trichoderma. Neither harmlessness nor toxin production can be established from its colour.
Raw-material, spawn, substrate and storage contamination differential across production systems.
Signs, checks & response →Environmental disorders
Ammonia, waterlogging and unsuitable substrate
Poorly colonised substrate can be a process failure before a competitor arrives. Treating the visible late mould may miss the original cause.
Ammonia/conditioning is especially relevant to button compost. Bag substrates use different preparation systems.
Signs, checks & response →