The Evaluation of Cross Infection of Sorghum Genotypes by Ustilago cynadontis (Henn. & Henn.), the Causal Agent of Smut in Couch grass [Cynodon dactylon (L.) Pers.] in South Sudan
Cross infection trials of Sorghum by smut of couch grass incited by (Ustilago cynadontis Henn. & Henn.) were conducted in 20L pots at University of Juba during 2017/2018 cropping season; located at latitude 4050, 529’N and longitude 31035, 417’E and at an altitude of approximately 400m above sea level. Six local sorghum genotypes were planted in pots replicated four times and arranged in a randomized complete block design; prior to planting each pot was artificially inoculated with teliospores from fifteen air dried Ustilago cynadontis sori. Results showed no cross infection in all six sorghum genotypes tested. The study recommends similar studies to be re-conducted to include a larger number of local sorghum genotypes since couch grass, Cynodon dactylon is a known alternate host of Sporisorium sorghi which is an established causal agent of covered kernel smut of sorghum.
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