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Greenhouse Humidity Control
The best defense against fungal infection for high-value, susceptible greenhouse crops is to create environmental conditions that promote a healthy, dry crop that is also hostile to fungal proliferation. This means controlling temperature and humidity such that water is not
accumulating on the surface of the plant tissue. Ideal conditions are those where the vapor pressure deficit is sufficiently high for water vapor to leave the foliage and enter the air, avoid dew formation at all times, and avoid water dripping/splashing on foliage.
The challenging hours occur when the sun goes down. A cooler night sky is the driver for glazing to become cold and for plants to radiate to the cooler glazing which results in the foliage reaching temperatures below the green- house air temperature. When the glazing/covering or the foliage reaches the dew point, wetness will occur. Wet glazing or screens can drip onto the crops. A water film from dripping or condensation is the pathway for mold spores to infect plant tissue.
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