Redcliffe Salaman's Scheme for Raising Virus-Free Potato Stocks: professionalization, institutionalization and regulation in interwar Britain's plant virus research.

This article examines Redcliffe N. Salaman's (1874-1955) efforts to establish a national system for producing virus-free seed potatoes in 1930s Britain. It explores how scientific authority was mobilized to reshape agricultural practices and assert regulatory control over seed production. Although Salaman's proposals were never fully realized, they laid the groundwork for enduring strategies to improve potato crop health by protecting seed from infectious agents and their insect vectors. Salaman's work drew on both traditional horticultural knowledge and emerging microbiological techniques, spanning field and laboratory settings. He exemplifies how diverse modes of science making shaped a period of increasing professionalization and institutionalization in the biological sciences. By tracing interactions between scientists and other actors - including growers, seedsmen and government officials - the article shows how plant virus control was gradually redefined from a craft-based practice to a scientific domain. This article contributes to the early history of virology from an agricultural perspective, as well as to broader historiographical debates on the role of science in agriculture, the professionalization of expertise and the construction of regulatory authority in twentieth-century Britain.