The Citron Compendium: The Citron (Etrog) Citrus Medica L.: Science and Tradition

Eliezer E. Goldschmidt (born 1938, Jerusalem) is a James De Rothschild Professor of Horticulture, emeritus, at the Hebrew University of Jerusalem. He earned his Ph.D. in 1968 and has been a professor since 1982. His research has focused on horticultural productivity with an emphasis on citrus. Prof. Goldschmidt is primarily known for his research on citron history and genetics. He developed a synthetic auxin treatment which is instrumental for the maintenance of a persistent style of; a feature which is highly significant in determining the halachic status of etrog citrons for their use in the feast of Tabernacles.

Moshe Bar-Joseph ( born 1939, Romania), founder and former Head of the S. Tolkowsky Laboratory for Citrus Disease Research at the Volcani Institute, ARO; Retired adjunct Professor of Plant Virology, Ben-Gurion University, Beer Sheva, Israel. He earned his Ph.D. in 1972. Moshe Bar-Joseph is a world-renowned citrus pathologist specializing in plant virology and experienced in citron propagation for viroid diagnosis. He conducted seminal investigations of the Citrus Tristeza Virus (CTV) disease and its spread in Israeli citrus orchards.