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Effect of Length of Rotation on Losses from Black Shank in Flue-Cured Tobacco Varieties¹

Synopsis: Five flue-cured tobacco varieties were grown in rotations on a black shank-infested soil. In the 1-year rotation, losses from black shank increased rapidly in succeeding tobacco crops, while in the 3-year rotation losses decreased. The difference in black shank losses between the 3- and 1-year rotations was significant in 1956 and 1957. The black shank pathogen was not eliminated from the soil by a 3-year rotation or a 4-year period between tobacco crops.

² Associate Agronomist, Bright Tobacco Research Station, Chatham, Va., Associate Agronomist and Plant Pathologist, respectively, Virginia Agr. Exp. Station. The authors are indebted to M. J. Rogers, Assistant Agronomist at the Virginia Bright Tobacco Research Station, and R. K. Stivers, formerly Associate Agronomist, Virginia Agr. Exp. Sta., now Assistant Agronomist, Purdue University, Lafayette, Ind., for assisting on this project.