Why the room matters more than the spray
Ubiquity: spores and bacteria are already around most gardens.
Imbalance: temperature, moisture, light, airflow, and pH set susceptibility.
Fungi: they need moisture, a usable temperature, acidity, and a food source.
Bacteria: they gain when the plant or root zone is already compromised, including low oxygen.
Filter the intake
HEPA
captures many incoming fungal spores
UVC
a germicidal lamp in the duct is listed as a way to kill microbes and spores
Stack
the book says the two methods can be combined
Clothes
spores also ride in on people and pets, so filtration is not the only gate
Act on the environment first
Speed
once disease shows, restore balance quickly
Best fix
a balanced room is still the main solution
Water
wet leaves at lights-off are a repeated mold trigger later in the appendix
Air
stagnant, crowded canopies keep surfaces wet longer
Takeaways
Prevention: exclusion and climate beat rescue sprays.
Scout: small infections are the ones you can still reverse.
Tools: clean blades so you do not move spores cut to cut.
Scope: fungal and bacterial problems are the two buckets most of this appendix covers.