J. J. Christensen

1892 – 1964

• Corn smut caused by Ustilago maydis
• Associations of microorganisms in relation to seedling injury arising from infected seed
• Seed-flax production in the north central states
• Studies on the toxicity of blighted barley to swine
• The origin of parasitic races of phytopathogenic fungi through mutation
• Variation in Helminthosporium sativum induced by a toxic substance produced by Bacillus mesentericus