Browsing Doctoral Degrees (Plant Pathology) by Title
Now showing items 19-38 of 47
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Genetic diversity of Oryza species in Niger ; screening and breeding for resistance to rice yellow mottle virus (RYMV)
(2012)Rice is a staple food in many West African countries, including Niger. However, both regional and national rice production have failed to meet demand due to several constraints, among which is the Rice yellow mottle virus ... -
Genetic effects and associations between grain yield potential, stress tolerance and yield stability in southern African maize (Zea mays L.) base germplasm.
(2005)Maize (Zea mays L.) is the principal crop of Southern Africa but production is threatened by gray leaf spot (Cercospora zea-maydis L.) and phaeosphaeria leaf spot (Phaeosphaeria maydis L.) diseases, drought and the use of ... -
A genetic study of resistance to African Rice Gall Midge in West African rice cultivars.
(2012)The African Rice Gall Midge (AfRGM), Orseolia oryzivora Harris and Gagné (Diptera: Cecidomyiidae), is an endemic rice pest found throughout Africa. The failure of most other control methods imposes the need to use crop ... -
Identification and characterization of viruses infecting cucurbits in the province of KwaZulu-Natal, Republic of South Africa, with the purpose of developing transgenic virus-resistant cucurbits.
(2016)The continued presence of cucurbit-infecting viruses across the Province of KwaZulu- Natal (KZN), South Africa requires exploration of alternative methods of controlling these viruses. The aim of this research project ... -
Infection of Kikuyu grass (Pennisetum clandestinum) by the rust fungus Phakopsora apoda.
(1998)A rust fungus on kikuyu grass (Pennisetum clandestinum Hochst. ex Chiov.) was identified as Phakopsora apoda (Har. & Pat.) Mains., and was reported for the first time in South Africa. An investigation was conducted into ... -
Integrated use of yeast, hot water and potassium silicate treatments for the control of postharvest green mould of citrus and litchi.
(2010)There is a growing recognition globally that many agrochemicals are hazardous to humans, animals and the environment. Therefore, there is a need to substitute these chemical products with biological and physical treatments, ... -
Integrating microdosing of fertilizers with biological control agents for maize production in the Eastern Cape, South Africa.
(2015)Maize is an important staple crop in South Africa, and is also used for animal feed. In the Eastern Cape Province in South Africa a larger percentage of the farmers are small scale farmers and lack financial resources to ... -
Isolation of entomopathogenic gram positive spore forming bacteria effective against coleoptera.
(2009)Fourteen spore-forming bacterial strains were isolated and screened for entomopathogenic activity. Five displayed toxicity towards the common mealworm, Tenebrio molitor L., (Coleoptera: Tenebrionidae). The majority of the ... -
Management of fusarium wilt diseases using non-pathogenic Fusarium oxysporum, and silicon and Trichoderma harzianum (ECO-T®)
(2008)In the genus Fusarium are many important plant pathogens. The diversity of hosts the genus attacks, the number of pathogenic taxa and the range of habitats in which they cause disease are the greatest in plant pathology. ... -
Organogenesis and genetic transformation of dierama erectum hilliard.
(2016)Abstract available in PDF file. -
Prevalence, detection and characterization of tomato spotted wilt and iris yellow spot tospoviruses occuring in Zimbabwe.
(2017)Abstract available in PDF file. -
Some effects of drying rate and wet storage on aspects of the physiology and biochemistry of embryonic axes from diesiccation- sensitive seeds.
(2004)Desiccation-sensitive seeds show differential viability characteristics during drying at different rates. A number of studies have demonstrated that rapid dehydration permits survival to lower water contents than does ... -
Studies on Alternaria porri and Stemphylium vesicarium on Allium spp.
(1993)During surveys in South Africa, Alternaria porri (Ellis) cif. and Stemphylium vesicarium (Wallr.) E. Simmons were found to be destructive seed-borne pathogens of onion (Allium cepa L. ). These two pathogens are also ... -
Studies on Cercospora zeae-maydis, the cause of grey leaf spot of maize in KwaZulu-Natal.
(2000)In 1983, Latterell and Rossi described grey leaf spot (GLS) of maize (Cercospora zeae-maydis Tehon and Daniels) as "a disease on the move". This pathogen has more than lived up to its reputation. It is estimated to be ... -
Studies on ear rot and grey leaf spot of maize in South Africa.
(1997)In recent years there have been economically important epidemics of both Stenocarpella ear rot and grey leaf spot (GLS) in South Africa. These epidemics have adversely affected the grain yield and quality of the maize ... -
Studies on Puccinia recondita f. sp. tritici with special emphasis on adult plant resistance in wheat.
(1986)Leaf rust (Puccinia recondita f.sp. tritici) of wheat (Triticum aestivum) was widespread in South Africa during 1983, 1984 and 1985 and often reached epidemic levels, especially on autumn-sown spring wheat in the Cape ... -
Studies on the expression of resistance of Coffea selections to Hemileia Vastatrix.
(1990)Physiological races of Hemileia vastatrix in southern Africa were identified. Prevalent races were I (2.2%), II (88.9%) and III (2.2%). Six samples could not be identified. Twelve biotypes of race II were distinguished. ... -
Studies on the expression of resistance to stem rust of wheat caused by Puccinia graminis f.sp. tritici.
(1991)The endogenous cytokinin levels of healthy primary leaves and seeds of a stem-rust susceptible wheat cultivar Little Club were compared with those of Little Club containing the stem rust resistance gene Sr25. Use was ... -
Studies on the pathogenicity of Puccinia graminis f. sp. Tritici and the nature of host resistance in wheat.
(1986)This study was undertaken to investigate the pathogenic variation of Puccinia graminis f.sp. tritici in South Africa and to determine the nature of host resistance to this fungus. Seventeen pathotypes of wheat stem ...