July 30, 2014

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Reduce humidity for greenhouse health

Lindie Huffman, Agriculture and Natural Resources

Humidity and condensation in the greenhouse present big challenges especially during winter when moisture tends to build up on roofs and side-walls.  Large numbers of plants grown in fairly crowded conditions produce even more moisture which adds to an inviting environment for plant pathogens like fungi and bacteria.

Relative humidity greater than 90-percent slows the drying of foliage and increases the amount of time condensation and overnight dew remain on plants.  High humidity also favors plant diseases that thrive on warm air, such as powdery mildew.