Why might frequent leaf-wetting be undesirable for leafy greens?

• A. It causes disease.
• B. It improves photosynthesis.
• C. It has no effect.
• D. It speeds up harvest.

Answer: (A)

Leaf wetness creates a consistently moist surface that invites disease. Many pathogens need free moisture on leaf surfaces to infect, germinate, and penetrate tissue. When overhead watering or frequent misting leaves stay wet, the microclimate around the foliage becomes conducive to infections such as Botrytis gray mold and other leaf diseases, leading to reduced yield and quality. Wet leaves can also harbor rot and blemishes that shorten shelf life. This isn’t beneficial for photosynthesis or harvest—photosynthesis relies on light, CO2, and proper leaf function, and wet leaves don’t boost it; they mainly raise the risk of disease and quality loss.