Calvert-Evers, Jennifer2017-02-172017-02-171996Calvert-Evers, Jennifer (1996) Characterization of dsRNA species in tobacco exhibiting non-geminivirus leaf curl symptoms, University of Witwatersrand, Johannesburg, <http://wiredspace.wits.ac.za/handle/10539/22062>http://hdl.handle.net/10539/22062A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in partial fulfillment of the requirements for the degree of Master of Science. Johannesburg, 1996.Tobacco in Southern Africa has been found to exhibit three forms of leaf curl (class I, II and III) based on symptomology. Class I tobacco leaf curl is a disorder of unknown etiology, appearing as bent or twisted leaves exhibiting frilly enations (leafy outgrowths) along the midrib and secondary veins of severely stunted tobacco plants.[Abbreviated Abstract. Open document to view full version]Online resource (86 leaves)enTobacco--Diseases and pestsThesis