Browsing Theses and Dissertations (University of Pretoria) by Supervisor "Van der Waals, Jacquie E. (Jacqueline Elise)"
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Browsing Theses and Dissertations (University of Pretoria) by Supervisor "Van der Waals, Jacquie E. (Jacqueline Elise)"
Now showing items 1-16 of 16
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(University of Pretoria, 2013)The potato (Solanum tuberosum L.) crop serves as a staple food worldwide and is capable of reducing the world’s food shortages because unlike cereals and other agricultural crops, it is less affected by prices in the ...
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(University of Pretoria, 2008-08-05)Cowpea is a worldwide-distributed crop, and is important to the livelihood of poor people in developing countries. Cowpea is also susceptible to a wide range of pests and pathogens, which can cause damage to the crop at ...
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(University of Pretoria, 2013)
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(University of Pretoria, 2011-09-23)Ralstonia solanacearum, a widely distributed soil-borne pathogen belonging to the β- subdivision of Proteobacteria, causes a lethal wilting disease of more than 450 plants species, including economically important crops ...
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(University of Pretoria, 2014)Alternaria alternata (Fr.) Keissler is now widely recognized as the causal agent of brown spot and black pit of potatoes. Brown spot is a foliar disease with potential to cause 30% yield loss and postharvest losses of ...
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(University of Pretoria, 2013)The first confirmation of the presence of Colletotrichum gloeosporioides Penz. on cashew in Mozambique was based on a combination of observed symptoms, isolation and identification using basic morphological and molecular ...
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(University of Pretoria, 2013)In recent years two new diseases, brown spot and black pit, have been observed on potatoes in South Africa. Brown spot symptoms appear on the foliage as small brown lesions, whereas black pit symptoms appear on the tubers ...
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(University of Pretoria, 2012)Rhizoctonia solani inoculum can be present either as soil- or tuber-borne sclerotia or hyphae. Although both inoculum sources play a role in disease development, it is not clear which of the two is more important. Successive ...
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(University of Pretoria, 2009)Pectobacterium carotovorum (Pbc), Dickeya spp., Pectobacterium atrosepticum (Pba), and a new, atypical strain, Pectobacterium carotovorum subsp. brasiliensis (Pbcb) can cause potato blackleg, soft rot and aerial stem rot. ...
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(University of Pretoria, 2019)Sclerotinia sclerotiorum (Lib.) de Barry, commonly known as Sclerotinia stem rot is one of the pathogens that have a potentially devastating impact on the growth of soybean industry in South Africa. Several quantitative ...
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(University of Pretoria, 2008)Lettuce (Lactuca sativa L.) seedlings diseases caused by soilborne pathogens are characterised by root rot, stem rot and damping-off of the seedlings that can occur at any time during growth. Fusarium solani, Pythium ultimum ...
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(University of Pretoria, 2012-09-14)Potato (Solanum tuberosum) is one of the most popular food crops grown as a substitute staple in Zimbabwe. Its production is constrained by pest and diseases which reduce the yield drastically. The blackleg / soft rot ...
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(University of Pretoria, 2019)Potatoes are popular and reliable crops all over the world. Unfortunately, its production is threatened by detrimental factors such as fungi, bacteria and viruses that attack potatoes during growth and storage. Among all ...
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(University of Pretoria, 2013)Fusarium is a soilborne fungus which can live in soil for long periods of time. It is known to cause wilt, root rot and crown rot diseases in a diverse group of crop plants. Of all the diseases caused by Fusarium the ...
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(University of Pretoria, 2013-06-28)Sunflower (Helianthus annuus L.) is the most important oilseed crop in South Africa at present and is grown in all summer rainfall areas. Sunflower seed oil is preferred over soybean and rapeseed oil because of its high ...
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(University of Pretoria, 2012)Spongospora subterranea (Wallroth) Lagerheim f. sp. subterranea Tomlinson (Sss) is the causal organism of potato powdery scab. This blemish disease is of economic concern to fresh and seed-tuber producers around the world, ...
Now showing items 1-16 of 16