Now showing items 1-4 of 4
Studies on the ecology and disease transmission of the psyllid vectors of the citrus greening disease, with special reference to the South African vector, Trioza erytreae [Del Guercio] [Homoptera : Psyllidae]
(Potchefstroom University for Christian Higher Education, 1970)
A comparatively new virus-like disease called greening has become a very serious threat in many citrus producing countries of the world. The disease is transmitted by two insect vectors belonging to the Psyllidae ...
Phage and bacteriocin receptor activity of a proteus vulgaris strain
(University of Pretoria, 1971)
Two hundred and sixty three Dienes incompatible strains of Proteus vulgaris were examined for the ability to produce bacteriocins active on Proteus vulgaris strain 69. This strain is the host organism in a transduction ...
An urban-geographical study of Randfontein
(North-West University, 1975)
Refer to full-text for the abstract
Die asimptotiese verdeling van kwadratiese vorme in onafhanklike stogastiese veranderlikes met toepassing op sekere passingstoetse
(North-West University (South Africa), 1972)
In hierdie hoofstuk word daar eerstens 'n oorsig gegee van die stogastiese proses benadering tot die bepaling van die asimptotiese verdeling van sekere passingstoetsgroothede. (Sien bv. Anderson en Darling (1952); Kac, ...