Record the location of contamination within a bottle or block.
Distinguish intended stem development from abnormal morphology.
Investigate primordia failure alongside substrate and climate records.
Normal is not always the same across mushrooms
A thick stem and relatively small cap may be the intended product, not the long-stem disorder of another species.
Evidence boundary: Korean bottle-contaminant and cobweb studies are regional evidence. Other Pleurotus photographs are not king-oyster case photographs.
Read the relevant condition guides
These links are a differential list, not a claim that your crop has all these diseases. Each entry states whether it is an established host report, a regional study or a generic process/safety risk.
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.
Some mites damage crops or carry contaminants; others feed on mould or other small organisms. Their presence may point to an underlying contamination problem.
A small moving speck is not enough to identify a harmful mite.
Identification can prevent the removal of useful organisms. Biological control still needs the correct pest, product, conditions and local legal status.
A decision guide, not an instruction to release an unapproved organism.
Interpret shape against the intended crop. Air exchange, carbon dioxide, light and crowding interact; a single photograph cannot choose a ventilation setpoint.
Species and strain matter: a shape desired in enoki or king oyster may be undesirable in another crop.
Counting days is not the same as checking readiness. Poor fruiting can follow immature substrate, an unsuitable transition, culture quality or infection.
Species-specific induction and fruiting systems, including cased and uncased crops.
A bag can contain competing mould before green colour is visible. Oyster-associated Trichoderma species differ from the main button-mushroom epidemic species.
Detailed pathogen evidence exists for Pleurotus; the other listed crops have published green-mould host reports, not a shared diagnosis.
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.