Choose your answer before opening the explanation. This is a learning exercise, not a competency assessment.
Which pair of conditions does NHB flag as favouring blotch?
- Humidity above 85 per cent with temperature above 20 C
- Humidity below 70 per cent at 15 C
- Any humidity at 12 C
- High carbon dioxide alone
See the answer and why
Humidity above 85 per cent with temperature above 20 C Blotch needs warmth and free water on the cap.

