Outdoor & Protected Cultivation
Rain, Dew & Flower Disease Risk
Flower disease risk rises when susceptible tissue stays wet or humid for extended periods, especially inside dense floral clusters with limited air exchange.
Key concepts
- Dew can wet flowers even without rainfall
- Dense canopies create local humidity different from weather-station readings
- Cool nights can increase condensation risk
- Dead or damaged tissue can provide infection sites
What to measure or observe
- Inspect flowers after rain and heavy dew
- Record overnight RH and temperature when possible
- Check dense interior flower zones
- Track periods of persistent cloud, fog, or repeated wetting
Common mistakes
- Using daytime humidity as the only risk indicator
- Assuming outdoor wind reaches the interior of every flower
- Waiting for obvious gray sporulation before inspecting
Visuals this lesson still needs
- Dew formation diagram
- Flower microclimate cutaway
- Wetness-duration timeline
- Disease-risk inspection map