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  • 1
    Electronic Resource
    Electronic Resource
    First report of Sphaeropsis canker on cypress in South Africa (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Forest pathology 27 (1997), S. 0 
    Details
    ISSN: 1439-0329
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In this study a Sphaeropsis sp. is recorded as causing cankers on cypress in South Africa. These cankers are either found alone or on trees which are infected with the well-known cypress canker pathogen, Seiridium unicorne. When the two fungi occurred together, lesions could not be distinguished from each other, although the greater number of lesions were caused by the Sphaeropsis sp. The fungus appears to be identical to that described as Sphaeropsis sapinea f.sp. cupressi, in Israel, which is a fungus very different from the pine pathogen, Sphaeropsis sapinea. Pathogenicity tests showed that the Sphaeropsis sp. is significantly more pathogenic to Cupressus lusitanica than to Pinus roxburgii and Pinus elliottii. S. sapinea was pathogenic only to the Pinus spp. tested, and not to C. lusitanica. In contrast, the cypress pathogen Seiridium unicorne, was pathogenic to C. lusitanica and also to the two Pinus spp. tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0329.1997.tb00858.x
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  • 2
    Electronic Resource
    Electronic Resource
    Canker and die-back of Eucalyptus in South Africa caused by Botryosphaeria dothidea (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 43 (1994), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Die-back and canker of several Eucalyptus species and clones were observed during a survey of the most important forestry areas of South Africa. Disease was often associated with extreme environmental conditions such as drought, hot winds and frost. Botryosphaeria dothidea, which is well known as a cause of canker and die-back of Eucalyptus in other countries, was consistently isolated from symptomatic trees. Artificial inoculations of Eucalyptus nitens resulted in lesion development, confirming the pathogenicity of 5. dothidea to Eucalyptus in South Africa. This is the first report of this disease in South Africa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1994.tb01653.x
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  • 3
    Electronic Resource
    Electronic Resource
    First report of the canker pathogen Endothia gyrosa on Eucalyptus in South Africa (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 42 (1993), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: During country-wide surveys of Eucalyptus plantations for Cryphonectria canker, cankers distinctly different from those usually associated with Cryphonectria cubensis were observed. These cankers were less severe and were exemplified by cracked and slightly swollen areas on the bark. Endothia gyrosa, a well-known pathogen of woody plants including Eucalyptus spp., was consistently associated with these cankers. The pathogen is easily distinguished from C. cubensis by the presence of orange-brown stromata and non-septate ascospores. Inoculations on Eucalyptus grandis resulted in lesions similar to those observed on naturally infected trees. The disease associated with E. gyrosa is widespread in South Africa, and research is required to establish control strategies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1993.tb01548.x
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  • 4
    Electronic Resource
    Electronic Resource
    Susceptibility of pines in South Africa to the pitch canker fungus subglutinans f.sp. pini (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 44 (1995), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Fusarium subglutinans f.sp. pini (F.s. pini)is the causal agent of pitch canker of pines. The fungus has recently been found in South Africa on the diseased roots of seedlings, but has as yet not been detected on mature trees in commercial forests. Inoculation of 1 -year-old and seedlings with isolates of resulted in canker development and shoot mortality. No significant differences in virulence were found among eight isolates of the pathogen on and but isolate MRC 6214 was significantly more virulent on seedlings than MRC 6209. Disease development was significantly more severe on and than on Pathogenicity tests on 4-year-old and trees yielded comparable results. Resinous cankers, similar to those described for pitch canker, developed on trees in the vicinity of inoculation points but development ceased before stems were girdled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1995.tb02747.x
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  • 5
    Electronic Resource
    Electronic Resource
    The fine structure of ascospore shape and development inCeratocystis fimbriata (1995)
    Springer
    Antonie van Leeuwenhoek 67 (1995), S. 325-332 
    Details
    ISSN: 1572-9699
    Keywords: Ceratocystis fimbriata ; C. moniliformis ; hat-shaped ascospores ; ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ascospore development inCeratocystis fimbriata Ell. & Halst. commenced in an eight-nucleate ascus. A single vesicle formed along the periphery of the ascus from fragments of ascospore delimiting membranes, surrounded all eight nuclei and eventually invaginated, first forming pouches with open ends, then finally enclosing each of the eight nuclei in a separate sac, thus delimiting ascospores. Pairing of the ascospores followed and brim formation occurred at the contact area between two ascospores. Osmiophilic bodies contributed to the formation of brim-like appendages by fusing to the ascospore walls. Additional brims were observed at opposite ends of the ascospores giving them a double-brimmed appearance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00872930
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    Paper (German National Licenses)
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