Articles by Author: Diana Marais

Search results for Diana Marais

We found 137 results for you
  1. Moringa (<em>Moringa oleifera</em>) leaf extracts inhibit spore germination of <em>Alternaria solani</em>, causal agent of early blight disease of tomato (<em>Solanum lycopersicum</em>)

    Moringa (<em>Moringa oleifera</em>) leaf extracts inhibit spore germination of <em>Alternaria solani</em>, causal agent of early blight disease of tomato (<em>Solanum lycopersicum</em>)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Alternaria solani is highly infective and can sporulate on tomato at 13.2 × 106 spores mL−1. The fungicidal effect of Moringa oleifera leaf chloroform and aqueous extracts (MLCE and MLAE, respectively) was investigated in vitro to determine the inhibitory effect...
  2. Plant anatomy as a tool for evaluating the effect of different levels of nitrogen, plant population density, row spacing and irrigation on kenaf (<em>Hibiscus cannabinus</em>) fibre development

    Plant anatomy as a tool for evaluating the effect of different levels of nitrogen, plant population density, row spacing and irrigation on kenaf (<em>Hibiscus cannabinus</em>) fibre development

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Kenaf (Hibiscus cannabinus) provides high-quality fibre that is used in papermaking, building materials and absorbents. The study aims were to conduct a proper anatomical study of fibre development in kenaf stems, and to investigate if the number of fibre wedges,...
  3. Direct Gamma Ray Densitometry of Wood

    Item type: Journal Article • Journal: South African Forestry Journal
    Wood density was determined in various wood species representing a wide range of densities using 60 KeV collimated soft gamma radiation from an Americium241 energy source. In the samples examined wood mass attenuation coefficients varied from 0,170 to 0,210 cm2g...
  4. Plant-Parasitic Nematodes in Forest Soils in the Transvaal and Natal, South Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    During a survey of plant-parasitic nematodes in forest soils between June 1989 and April 1991,164 soil samples were collected from forestry areas in the Transvaal and Natal. Acacia mearnsii plantations, species of Pinus and Eucalyptus, indigenous forests and virgin veld...
  5. Plant Nematodes in the Bergplaas Plantation, Western Cape Province with a Description of a New <em>Criconema</em> Species and Notes on Two Known Species of Criconematidae

    Item type: Journal Article • Journal: South African Forestry Journal
    During a survey of plant-parasitic nematodes in the Bergplaas Plantation, Western Cape Province, one Acacia melanoxylon compartment, seven Pinus compartments and twenty-two pockets of indigenous forest and virgin veld were sampled. Criconema, Rotylenchus and Scutellonema species were found at most...
  6. Variability in leaf surface features and water efficiency utilisation in C<sub>3</sub> and C<sub>4</sub> forms of <em>alloteropsis semialata</em> (R. Br.) hitchc.

    Variability in leaf surface features and water efficiency utilisation in C<sub>3</sub> and C<sub>4</sub> forms of <em>alloteropsis semialata</em> (R. Br.) hitchc.

    Alloteropsis semialata (R. Br.) Hitchc. occupies a unique position both taxonomically and physiologically in the Gramineae in that C3 and C4 photosynthetic and anatomical forms exist within a single taxonomic species. Both forms have been collected from a single ecological...
  7. Die potensiaal vir droëland aangeplante weiding in die vrystaatstreek

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Die uitbreidingspotensiaal van aangeplante weiding in die Vrystaatstreek is ondersoek. Die potensiaalomskrywing is gedoen aan die hand van klimatologiese oorwegings, beskikbaarheid van grond en die winsgewendheid van aangeplante weiding teen‐oor veld, mielie‐ en koringproduksie.
  8. An evaluation of the economic viability of commercial pastoralism in the <em>smaldeel</em> area of the Eastern Cape

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Carrying capacity models and financial data from study group farmers were used to derive attainable net revenue per ha on veld in good, moderate and poor condition. From these data, minimum farm sizes required for a reasonable standard of living...
  9. Effect of wilting on biochemical and microbiological changes in Kikuyu <em>(Pennisetum clandestinum</em> Hochst) silage

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Small‐scale laboratory silos were used to study the fermentation process of Kikuyu (Pennisetum clandestinum Hochst) silage prepared from grass containing 25% and 40% dry matter. Silage made from grass containing 40% dry matter was found to be better preserved and...