Agrobacterium tumefaciens
Nellie Adalesa Brown (1876–1956) was an American botanist and government researcher. Much of her research focused on plant pathology. While working with Charles Orrin Townsend and Agnes J. Quirk as assistants for Erwin Frink Smith, Brown and her colleagues described "Agrobacterium tumefaciens", the organism responsible for crown gall in 1907. They also identified methods of mitigation.