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A Rapid Method of Identifying Helminthosporium maydis Race T from Spore Samplers. Jack R. Wallin, Research Plant Pathologist, ARS, USDA, Ames, Iowa 50010; Daniel V. Loonan, Research Technician, ARS, USDA, Ames, Iowa 50010. Phytopathology 64:899. DOI: 10.1094/Phyto-64-899.

A rapid method of determining the identity and viability of Helminthosporium maydis race T spores caught by an air sampler was developed. Cellulose tape bearing trapped spores was placed on corn-seedling leaves, which were put into a moist chamber for 18 h. Typical blight symptoms appeared 3-5 days after incubation.