Incidence and Distribution of Downy Mildew Disease (Peronosclerospora Sorghi) of Sorghum in Uganda

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dc.contributor.authorFrank, Kumi
dc.contributor.authorSymphorien, Agbahoungba
dc.contributor.authorArfang, Badji
dc.contributor.authorThomas, Odong
dc.contributor.authorRichard, Edema
dc.contributor.authorMildred, Ochwo- Ssemakula
dc.contributor.authorDianah, Nakubulwa
dc.contributor.authorGeoffrey, Tusiime
dc.contributor.authorMoses, Biruma
dc.contributor.authorPatrick, Rubaihayo
dc.date.accessioned2022-02-01T07:01:45Z
dc.date.available2022-02-01T07:01:45Z
dc.date.issued2018
dc.description.abstractSorghum (Sorghum bicolor) ranks as the third most important staple cereal food crop in Uganda after maize and millet. The crop is hampered by several biotic stresses of which Sorghum Downy Mildew disease is one of the most devastating diseases. The disease is caused by a soil-borne fungus Peronosclerospora sorghi but it is also air-borne through conidia. Incidence and severity of downy mildew were conducted between March-June, 2016 and September-December 2016 growing seasons in 13 sorghum-growing districts across ten agroecological zones. Data collected were subjected to analyses of variance, correlation and linear regression. Significant (P < 0.001) differences were recorded for disease incidence and severity across the different agro ecologies. The mean downy mildew disease incidence varied significantly (P< 0.001) from 49.4 % for Pader to 78.9 % for Namutumba. Disease severity varied significantly (P <0.001) from 2.3 for Pader to 3.5 for Pallisa. Chi-square test for independent association between cropping season and downy mildew disease incidence showed a high significant test statistic values (χ2 = 140.89, d.f = 3, and P < 0.001). A significant (P<0.001) positive correlation was observed between disease incidence and severity (r = 0.498) while a significant negative correlation was observed between disease incidence and rainfall (r = -0.675) due largely to temperature and relative humidity. Multiple linear regression analysis revealed that temperature, relative humidity, rainfall and altitude explained 49 % of the total variation associated to disease incidence. Variations in the incidence and severity of downy mildew disease prompt the need to screen for resistant/tolerant sorghum varieties.en_US
dc.identifier.citationKumi, F., Symphorien, A., Badji, A., Odong, T., Edema, R., Ochwo-Ssemakula, M., ... & Rubaihayo, P. (2018). Incidence and distribution of downy mildew disease (peronosclerospora sorghi) of sorghum in Uganda. DOI:10.21474/IJAR01/7117en_US
dc.identifier.issn2320-5407
dc.identifier.urihttp://dx.doi.org/10.21474/IJAR01/7117
dc.identifier.urihttps://nru.uncst.go.ug/xmlui/handle/123456789/1719
dc.language.isoenen_US
dc.publisherInternational Journal of Advanced Research (IJAR)en_US
dc.subjectConidiaen_US
dc.subjectIncidenceen_US
dc.subjectSeverityen_US
dc.subjectResistanceen_US
dc.subjectMultiple linear regressionen_US
dc.subjectChi-squareen_US
dc.titleIncidence and Distribution of Downy Mildew Disease (Peronosclerospora Sorghi) of Sorghum in Ugandaen_US
dc.typeArticleen_US
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