Browsing Doctoral Degrees (Plant Pathology) by Issue Date
Now showing items 1-20 of 45
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An epidemiological analysis of the Phytophthora and Alternaria blight pathosystem in the Natal Midlands.
(1980)The history of the development in Natal of a forecasting service to warn of outbreaks of late blight disease caused by Phytophthora infestans is presented. The late blight pathogen and Alternaria solani, the causal ... -
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 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 ... -
A study on the ultrastructure and control of the gladiolus rust pathogen, Uromyces transversalis.
(1988)The substomatal vesicle of Uromyces transversalis develops in five distinct stages after the formation of a single infection peg in the host plant Gladiolus spp. The primary hyphae of the substomatal vesicle orientate ... -
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 resistance of wheat and maize to fungal pathogenesis.
(1990)17-Day-old seedlings of winter-wheat cultivar SST25 were inoculated with an avirulent race of wheat leaf rust, Puccinia recondita f.sp. tritici. After various time intervals the plants were reinoculated with a virulent ... -
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 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 ... -
The use of Agrobacterium for plant improvement.
(1994)Agrobacterium species have potential as tools for plant improvement, in that they can be used as biological control agents against crown gall disease, vectors for gene insertion into plants and plant root-inducing ... -
The epidemiology and control of Leptosphaeria maculans cause of Crucifer Blackleg, in KwaZulu-Natal.
(1996)The perfect stage of Leptosphaeria maculans is reported for the first time in South Africa. Viable pseudothecia and pycnidia were found on dead, weathered tissue, sometimes in close association, whereas only pycnidia ... -
Epidemiology and management of grey leaf spot : a new disease of maize in South Africa.
(1996)Grey leaf spot is a relatively new fungal disease of maize in South Africa. It has become well established in the province of KwaZulu-Natal, and is capable of reducing grain yields by 20 to 60%. The disease is spreading ... -
Ultrastructure, cytochemistry and immunocytochemistry of the interaction between wheat (Triticum aestivum) and leaf rust (Puccinia Recondita f.sp. tritici)
(1996)The development of infection structures, derived from urediospores of Puccinia recondita f.sp. tritici in near-isogenic lines of susceptible and resistant wheat, and in non-hosts, viz. maize, oat, sorghum and barley, ... -
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 ... -
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 ... -
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 ... -
Aspects of post-harvest seed physiology and cryopreservation of the germplasm of three medicinal plants indigenous to Kenya and South Africa.
(2002)The current state of global biodiversity is one of sustained and increasing decline especially in developing countries such as South Africa, where, medicinal plants face a particular threat due the herbal medicine trade, ... -
The effects of Trichoderma (Eco-T) on biotic and abiotic interactions in hydroponic systems.
(2003)The following body of research provides a detailed overview of the interactive effects of biocontrol agents and environmental factors and how these influence both the host plant and pathogen populations within hydroponic ... -
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 ... -
Biological control and plant growth promotion by selected trichoderma and Bacillus species.
(2005)Various Trichoderma and Bacillus spp. have been documented as being antagonistic to a wide range of soilborne plant pathogens, as well as being plant growth stimulants. Successes in biological control and plant growth ... -
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 ...