Articles by Author: Markd Laing

Search results for Markd Laing

We found 33 results for you
  1. Incidence of Natural Ectomycorrhizal Infection of Pine and Eucalypt Seedlings in Three KwaZulu-Natal Nurseries

    Item type: Journal Article • Journal: South African Forestry Journal
    A survey of the incidence of natural ectomycorrhizal infection on selected species of pines and eucalypts was conducted in three commercial timber nurseries near Pietermaritzburg in 1990. A follow-up survey was conducted on one of the nurseries in 1995. The...
  2. Genetic characterisation of a <em>Eucalyptus nitens</em> base breeding population in South Africa

    Genetic characterisation of a <em>Eucalyptus nitens</em> base breeding population in South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The measurement and statistical analysis of data from eight Eucalyptus nitens trials, established in the summer rainfall forestry region of South Africa during the 1980s and 1990s, have enabled the characterisation of the Institute for Commercial Forestry Research's breeding population...
  3. The economic benefits of fungicide treatment of maize for the control of grey leaf spot (<em>Cercospora zeae-maydis</em>) in KwaZulu-Natal

    The economic benefits of fungicide treatment of maize for the control of grey leaf spot (<em>Cercospora zeae-maydis</em>) in KwaZulu-Natal

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Grey leaf spot (Cercospora zeae-maydis Tehon and E.Y. Daniels) is a relatively new disease of maize in South Africa and is capable of reducing grain yields by 20–60% in KwaZulu-Natal. Fungicides are widely used for control, but must be applied...
  4. Susceptibility of maize hybrids to grey leaf spot under two tillage systems in South Africa

    Susceptibility of maize hybrids to grey leaf spot under two tillage systems in South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Grey leaf spot (Cercospora zeae-maydis Tehon and E.Y. Daniels) has seriously decreased the yields of maize in KwaZulu-Natal, South Africa, and has been identified in neighbouring provinces and countries. Since no commercially grown hybrids have been identified to be resistant...
  5. Differential susceptibility of commercial zucchini cultivars to viruses of cucurbits

    Differential susceptibility of commercial zucchini cultivars to viruses of cucurbits

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A study to assess the effectiveness of some zucchini [Cucurbita pepo (L.)] cultivars in limiting the effects of virus disease in zucchini crops was conducted at Bayne's Drift, KwaZulu-Natal. The severity of disease was assessed using a visual rating scale...
  6. Biological control of <em>Rhizoctonia solani</em> by two <em>Trichoderma</em> species isolated from South African composted soil

    Biological control of <em>Rhizoctonia solani</em> by two <em>Trichoderma</em> species isolated from South African composted soil

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Strains of two Trichoderma species isolated from composted soil were evaluated for biological control of Rhizoctonia solani. Macroscopic observations of in vitro bioassays revealed that the Trichoderma isolates overgrew the pathogen completely and that a brownish discolouration occurred at the...
  7. Effect of commercially available rhizobacteria strains on growth and production of lettuce, tomato and pepper

    Effect of commercially available rhizobacteria strains on growth and production of lettuce, tomato and pepper

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Seven microbial products of the genus Bacillus were evaluated under greenhouse and shadehouse conditions for efficacy on lettuce, tomato and pepper as plant growth promoters. Treatments were applied as a drench (106 cfu ml1) directly onto seedlings in composted pine...
  8. Light, scanning and transmission electron microscopy studies on the conidiogenesis of <em>Cercospora zeae-maydis</em> on maize

    Light, scanning and transmission electron microscopy studies on the conidiogenesis of <em>Cercospora zeae-maydis</em> on maize

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Light, scanning and transmission electron microscopy were used to study conidiophore formation and conidiogenesis by Cercospora zeae-maydis Tehon & Daniels, the causal organism of grey leaf spot on maize, Zea mays L. Hyphae aggregate in the substomatal cavity and give...
  9. Gene action determining <em>Phaeosphaeria</em> leaf spot disease resistance in experimental maize hybrids

    Gene action determining <em>Phaeosphaeria</em> leaf spot disease resistance in experimental maize hybrids

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Phaeosphaeria leaf spot (Phaeosphaeria maydis Henn.) has the potential to cause substantial yield losses in maize. Maize is grown by small-scale farmers without fungicides; hence there is need to breed for resistance in regionally adapted germplasm. Little information about the...
  10. Raptors drowning in farm reservoirs in South Africa

    Raptors drowning in farm reservoirs in South Africa

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Anderson, M.D., Maritz, A.W.A. & Oosthuysen, E. 1999. Raptors drowning in farm reserviors in South Africa. Ostrich 70 (2): 139–144