<p>This thesis describes the effects of various rotations on the growth pattern, yield and quality of potato and on the incidence of soil-borne pathogens, other than potato cyst nematodes ( <em>Globodera</em> spp.), associated with potato. These rotations differed in the frequency of potato and in the crops with which the potato crop was rotated.<p>The effects of the rotations depended greatly on the soil type. Lower yields of potato in short rotations were mainly caused by <em>Streptomyces</em> spp. (causing netted scab), <em>Rhizoctonia solani, Verticillium dahliae</em> and, on sandy soil, also by root-knot nematodes <em>(Meloidogyne hapla</em> and <em>M.chitwoodi).</em> Rotation effects were indirectly influenced by the root-lesion nematodes <em>Pratylenchus thornei and P.neglectus,</em> and under special conditions, also by <em>Colletotrichum coccodes.</em> The susceptibility and tolerance of potato cultivars to these pathogens and synergistic interactions between the various pathogens largely determined the final yield depressions in the short rotations.
|Qualification||Doctor of Philosophy|
|Award date||14 Dec 1989|
|Place of Publication||S.l.|
|Publication status||Published - 1989|
- solanum tuberosum
- crop damage