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    Alternate control (1)
    Aphelinus hordei (1)
    Aphids -- Biological control -- South Africa -- Free State (1)
    Aphids -- Insecticide resistance -- South Africa -- Free State (1)
    Aqueous plant extracts (1)
    Diaeretiella rapae (1)
    Dissertation (M.Sc. ((Zoology and Entomology))--University of the Free State, 2011 (1)
    Diuraphis noxia (1)
    Emerging farmers (1)
    Olfactometer tests (1)