Pests are mostly small flies whose maggots eat mycelium and tunnel into stems. DMR's action threshold after the second flush is more than 20 flies per trap per week. NHB says screen doors and vents with nylon net of 35 mesh or finer, and use a 15 watt yellow light trap with an oiled sheet to monitor them.
Disorders are not caused by any organism. Long stems from CO2, cracked caps from dry air, a sealed casing from high CO2 during pinning: these look like disease but are the room talking.