Articles by Author: L Swart

Search results for L Swart

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  1. <em>Cryphonectria</em> Canker of <em>Eucalyptus</em>, an Important Disease in Plantation Forestry in South Africa.

    Item type: Journal Article • Journal: South African Forestry Journal
    Cryphonectria cubensis, one of a notorious group of canker pathogens of trees and the cause of a serious disease of Eucalyptus, has recently been found in South Africa for the first time. This review provides the first compilation of the...
  2. Future Needs of Mycorrhizal Research in South African Forestry

    Item type: Journal Article • Journal: South African Forestry Journal
    The association formed by the short roots of Pinus and Eucalyptus species with mycorrhizal fungi results in increased nutrient absorption and protection from pathogens. Different species of mycorrhizal fungi vary greatly in their effectiveness toward a given host species under...
  3. Phaeoseptoria Leaf Spot of <em>Eucalyptus</em> in South Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    Phaeoseptoria eucalypti is one of the more important leaf pathogens of Eucalyptus spp. in South Africa. It is capable of causing complete defoliation of an entire plantation and the death of seedlings. This paper reviews the available literature on the...
  4. Shoot and Needle Diseases of <em>Pinus</em> spp. in South Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    Fungi associated with needle and shoot diseases of Pinus spp. in South Africa were surveyed. Sphaeropsis sapinea caused shoot die-back of trees and seedlings of numerous pine species while Colletotrichum acutatum caused similar symptoms on seedlings of P. radiata. Dothistroma...
  5. A Review of <em>Lasiodiplodia theobromae</em> with Particular Reference to its Occurrence on Coniferous Seeds

    Item type: Journal Article • Journal: South African Forestry Journal
    The fungal pathogen Lasiodiplodia theobromae has been associated with numerous plant diseases on a wide variety of hosts. Conifers seem to be particularly susceptible to infection, although the true parasitic status of the fungus is still largely unresolved. In South...
  6. Foliicolous Fungi of <em>Eucalyptus</em> spp. from Eastern Madagascar: Implications for South Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    A collection of Eucalyptus leaves from Madagascar revealed several foliicolous fungi to be present, most being new records for the country. Known foliar pathogens such as Aulographina eucalypti, Cylindrocladium quinqueseptatum, Kirramyces epicoccoides, Pseudocercospora eucalyptorum, Harknessia hawaiiensis and Mycosphaerella heimii were...
  7. The utilization and feeding value of milled woody plant species

    The utilization and feeding value of milled woody plant species

    Trials were conducted where ground material of Tarchonanthus camphoratus, Grewia flava and Terminalia sericea, supplemented with molasses and in some treatments with maize meal and/or urea, were fed to Afrikaner cows. Digestibility studies on Tarchonanthus camphoratus and Grewia flava plus...
  8. Screening of <em>Pinus radiata</em> Progenies for Resistance to <em>Sphaeropsis sapinea</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    The relative susceptibilities of half-sib progenies of Pinus radiata obtained from seed parents selected for apparent resistance to the pine pathogen Sphaeropsis sapinea in plantations in the Western Cape and Chile were assessed in two separate trials. In each trial,...
  9. Kwantitatiewe kaartinterpretasie by streeksbeplanningsopnames

    Kwantitatiewe kaartinterpretasie by streeksbeplanningsopnames

    Gedurende opnames in the Bo‐Oranjerivier‐opvanggebied is talle streeks beplanningskaarte saamgestel. ‘n Prosedme om kwantitatiewe inligting uit sulke kaarte te ontgin word aangebied. Met behulp van rekenaarontledings is nuttige syfers oor die oppervlakteverspreiding van dominante plantegroei‐eenhede en hulle assosiasie met ooreenstemmende...
  10. Relations between soil factors and herbage yields of natural grassland on sandy soils in the south‐eastern Transvaal

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Forty systematically‐placed observation points were established in a 1.5‐ha area of floristically unifoim veld in which productivity varied spatially. At each point grass yields were determined by harvesting quadrats at eight‐week intervals during the growing season, and the volumetric water...