G80-488 Spring and Summer Black Stem Diseases of Alfalfa (Revised June 1992)

Authors

John E. Watkins, University of Nebraska–LincolnFollow
Fred A. Gray, University of Wyoming

Date of this Version

1980

Comments

© 1980, The Board of Regents of the University of Nebraska on behalf of the University of Nebraska–Lincoln Extension. All rights reserved.

Abstract

Spring and summer black stem of alfalfa, their causes, symptoms, and control are discussed.

Of the two black stem diseases found in the central and northern Great Plains, spring black stem predominates summer black stem. Both are damaging when weather conditions favor their development. Although their symptoms differ, each causes spotting and darkening of stems and spotting of leaves.