Browsing Plant Pathology by Issue Date
Now showing items 1-20 of 104
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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 ... -
Cultivation of exotic and local mushroom species for commercial production.
(1995)The project was undertaken primarily to determine the potential of growing Stropharia rugoso-annulata and Volvariella volvacea at a commercial level under South African conditions. Termitomyces umkowaani, an indigenous ... -
The epidemiology and control of Capsicum viruses in Natal.
(1995)Virus diseases pose a serious threat to commercial pepper (Capsicum annuum L.) production in Natal. Following a survey of the principal capsicum-producing areas, potato virus Y (PVY) was found to be the predominant virus ... -
Maize root rot in South Africa.
(1995)Numerous fungal species are known to infect maize roots and eventually cause rot. The spectrum of fungi differs over localities as well as their relative frequencies. Fungi isolated from discoloured root tissue and root ... -
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 ... -
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, ... -
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 ... -
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 ... -
Control of insect-transmitted viruses in cucurbit crops in KwaZulu- Natal.
(1998)The production of cucurbits (Cucurbitaceae) in KwaZulu-Natal faces the constant threat of viral diseases. These can be so severe as to severely limit or prevent production in the latter part of the growing season ... -
Factors affecting germination and growth of sugarcane transplants.
(1998)Transplants are produced and sold in South Africa for the planting of seedcane supply plots (nurseries), commercial fields, and for gap filling. The most important factor constraining the use of transplants is the low ... -
The epidemiology and control of crucifer chocolate spot.
(1998)In the 1991/92 season, a leaf spotting disease of crucifer seedlings appeared at a number of nurseries in Kwazulu-Natal (KZN) Province. Towards the end of 1996, the disease had also been detected in Western and Northern ... -
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 ...