Abstract
The effect of relative humidity during production and germination of conidia of Erysiphe graminis f.sp. hordei was examined in the laboratory. High humidities at both stages promoted the infectivity of the conidia. Experiments with different soil depths showed that deeper soils resulted in higher humidities around the plants and significantly greater levels of disease. When differential humidity build-up around the plants during different watering regimes was prevented there was no significant difference in disease development. This confirms that the effects observed were due to changes in atmospheric relative humidity, not to alterations in the water supply to the host plant.
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