Rotorod spore samplers and a Burkard volumetric spore sampler were placed next to each other in an orchard and used to simultaneously collect Venturia inaegualis ascospores naturally discharged during rain. In addition, these spore samplers were operated next to each other inside a closed room in which V. inaequalis ascospores were released via the exhaust of a spore-release tower. These data were used to determine the relative collection efficiency of the two types of samplers for airborne V. inaequalis ascospores. In the relatively still air of the laboratory, E Rotorod was ∼0.24 E Burkard . In the field, E Rotorod was ∼0.37 E Burkard [...]
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Donald E. Aylor (1993) studied this question.