Which environmental factors influence fungal infection in plants?

• A. Moisture and temperature
• B. Humidity only
• C. Temperature only
• D. Light exposure

Answer: (A)

Fungal infection in plants mainly depends on environmental conditions that let spores germinate, invade, and grow. The two strongest factors are moisture and temperature. Leaf wetness from rain, dew, or overhead irrigation provides the water spores need to germinate and penetrate plant tissues. Temperature influences how fast the fungus grows and whether the host plant is stressed in a way that favors infection; many turf and ornamental pathogens have optimal ranges where disease pressure is highest, especially when moist conditions align with these temperatures. Humidity or light exposure alone don’t drive infections the same way; humidity contributes to leaf wetness but isn’t sufficient without surface moisture, and temperature without moisture isn’t enough to start infection.