Scab disease of cowpea (Vigna unguiculata) caused by Sphaceloma a species of the fungus
Article first published online: 26 FEB 2008
Annals of Applied Biology
Volume 96, Issue 1, pages 11–16, September 1980
How to Cite
EMECHEBE, A. M. (1980), Scab disease of cowpea (Vigna unguiculata) caused by Sphaceloma a species of the fungus. Annals of Applied Biology, 96: 11–16. doi: 10.1111/j.1744-7348.1980.tb04763.x
- Issue published online: 26 FEB 2008
- Article first published online: 26 FEB 2008
- Accepted 31 March 1980; Received 23 November 1979
Scab disease of cowpea (Vigna unguiculuta) was shown to be caused by Sphaceloma sp. It affects all above ground parts of the plant. The first symptom of the disease, appearing within 3 to 6 days of inoculation, is puckering of the lamina. Spots on mature leaves are white with or without brown margins. Typical scab lesions on petiole, stem, peduncle and pod are white turning dark brown when chlamydospores are formed and are oblong-elongate except for pod lesions that are ovoid. The most destructive phase is scab of the flowering axis which causes flower and, or, pod abortion or completely prevents flower formation.
Inoculation of asparagus pea (V. sesquipedalis) with a cowpea isolate of Sphaceloma sp. produced symptoms similar to those on cowpea. Inoculated hyacinth bean (Lablab niger) produced atypical mild lesions. The following legumes were not affected when artificially inoculated with the fungus: black gram (Phaseolus mungo), green gram (P, aureus), French bean (P. vulgaris), Lima bean (P. lunatus), groundnut (Arachis hypogaea), and soyabean (Glycine max). The characteristics of the fungus on potato dextrose agar are described.