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  1. An Evaluation of the Use of “Gentan” Probabilities in Forestry Planning

    An Evaluation of the Use of “Gentan” Probabilities in Forestry Planning

    Item type: Journal Article • Journal: South African Forestry Journal • Authors: JohnH. Randall --- Department of Biometry, South Africa Klaus von Gadow --- Department of Forest Science, South Africa
    An evaluation of Suzuki's concept of Gentan probabilities is presented. Model fitting is discussed in some detail. It is shown that the Gentan method is suitable only for forests that are at least close to normality.
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  2. Biology of <em>Cicadulina</em> leafhoppers and epidemiology of maize streak virus disease in West Africa

    Biology of Cicadulina leafhoppers and epidemiology of maize streak virus disease in West Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: NilsaA. Bosque-Pérez --- Department of Plant, Soil and Entomological Sciences, USA I.W. Buddenhagen --- Department of Agronomy and Range Science, USA
    Studies have been conducted in Nigeria on biology of Cicadulina leafhopper vectors of maize streak virus (MSV), the role of indigenous grasses as reservoirs of virus and vectors, and on incidence and severity of MSV in relation to maize varietal...
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  3. Patterns and drivers of marine bioinvasions in eight Western Cape harbours, South Africa

    Patterns and drivers of marine bioinvasions in eight Western Cape harbours, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Peters --- Centre for Invasion Biology, Department of Biological Sciences, South Africa C Griffiths --- Marine Biology Research Centre, Department of Biological Sciences, South Africa TB Robinson --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa
    In South Africa, fouling is the dominant vector of marine invasions, being responsible for 48% of the 86 alien introductions that are known. This study aimed to document alien species in fouling assemblages in eight Western Cape harbours and to...
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  4. <em>Ceratocystis</em> species: emerging pathogens of non-native plantation <em>Eucalyptus</em> and <em>Acacia</em> species

    Ceratocystis species: emerging pathogens of non-native plantation Eucalyptus and Acacia species

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: J Roux MJ Wingfield
    The fungal genus Ceratocystis includes many economically important tree pathogens. Until the 1980s, this genus of plant pathogens was not known from non-native plantation-grown forestry species. However, during the course of the last 20 years, a number of reports have...
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  5. Space and spatially structured environmental variables account for variation in blackfly and mayfly communities in sub-tropical South African rivers

    Space and spatially structured environmental variables account for variation in blackfly and mayfly communities in sub-tropical South African rivers

    Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PA Ramulifho --- University of South Africa, South Africa SH Foord --- University of Venda, South Africa NA Rivers-Moore --- University of KwaZulu-Natal, South Africa
    Using aquatic invertebrate assemblages for bioassessment of streams and rivers is a fast and cost-effective approach to studying the impact of environmental stressors in aquatic ecosystems. The use of aquatic invertebrates is premised on their predictable responses to environmental stressors...
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