Wet bubble makes shapeless wet masses that may drip amber liquid; ICAR-DMR notes its resting spores survive up to three years in casing soil. Dry bubble makes dry, deformed mushrooms with split leathery caps. Green mould shows as green patches, linked by ICAR-DMR to immature spawn and low pH.
Pests overlap with these. Sciarid larvae tunnel into stems and pinheads, which die and brown, and a hurried eye reads disease. Mites cause reddish-brown discolouration. The difference is that pests leave the pest: adults in the trap, larvae in a cut stem, mites moving under the lens. Find the organism and it is a pest problem, whatever the mushroom looks like.