Detection of Seed- borne Fungi on Naturally Infected Seeds of Sesame

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Baghdadi, A.M.
Salih, A.A.
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Faculty of Agriculture, University of Khartoum, Shambat, Sudan
Inspection of dry seed samples of sesame collected from different parts of the Sudan showed that 72% of the seed samples contained dark black tiny sclerotia on the surface of the seeds. These were identified as the fungus Macrophomina phaseolina. Also, brown to grey discolouration of seeds was observed. A number of fungi were detected in untreated and pre-treated seeds by the blotter method. In untreated seeds, 13 seed-borne fungi were found. Alternaria sesami and M. phaseolina were detected in about 76% of the samples, while the percentage of other fungi was rather low. In pre-treated seeds, only 6 seed-borne fungi were encountered and the percentages of A. sesame and M. phaseolina were also high (72%). Other fungi showed small percentages of incidence in few samples. The results of untreated and pre-treated seeds indicate clearly that A. sesami and M. phaseolina are more common on sesame seeds than other fungi. The occurrence of Curvularia lunata and Drechslera tetramera in pre-treated seeds is a new record as seed-borne fungi in sesame.
Page(s): 1 (2), 135- 143, 18 Ref
Dry seed, Sudan, blotter method and pre-treated seeds.