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Browsing by UP Author "Van der Waals, Jacqueline Elise"
Now showing items 1-20 of 40
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Simango, Kenedy; Slabbert, Christopher P.; Van der Waals, Jacqueline Elise (Springer, 2020-06)Spongospora subterranea f. sp. subterranea (Sss) is an obligate parasite that can only multiply within the living tissues of a host plant. To determine the host status of Sss in some of the crops and weeds commonly found ...
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Muzhinji, Norman; Truter, Mariëtte; Woodhall, J.W.; Van der Waals, Jacqueline Elise (American Phytopathological Society, 2015-12)A survey of anastomosis groups (AGs) of Rhizoctonia species associated with potato diseases was conducted in South Africa. A total of 112 Rhizoctonia solani and 19 binucleate Rhizoctonia (BNR) isolates were recovered ...
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Du Raan, S.; Coutinho, Teresa A.; Van der Waals, Jacqueline Elise (Springer, 2016-02)Potato blackleg and soft rot cause major losses and are caused by two bacterial genera, Pectobacterium and Dickeya. Species affecting potatoes are Pectobacterium atrosepticum (Pba), Pectobacterium carotovorum subsp. ...
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Van der Waals, Jacqueline Elise; Krüger, K.; Franke, A.C.; Haverkort, A.J. (Anton); Steyn, J.M. (Joachim Marthinus), 1963- (European Association for Potato Research, 2013-03)A set of daily weather data simulations for 1961 to 2050 were used to calculate past and future trends in pest and disease pressure in potato cropping systems at three agro-ecologically distinct sites in South Africa: ...
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Takooree, Sandhya Devi; Neetoo, Hudaa; Ranghoo-Sanmukhiya, Vijayanti Mala; Vally, Vivian; Bulajic, Aleksandra R.; Van der Waals, Jacqueline Elise (University of Belgrade - Faculty of Agriculture, 2022)Late blight, a disease caused by oomycota, Phytophthora infestans, is a greater threat to the potato crop than any other disease in Mauritius. This disease remains the most challenging to manage once symptoms have appeared, ...
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Wright, Jessica; Lees, Alison K.; Van der Waals, Jacqueline Elise (Academy of Science of South Africa, 2012-05-16)Powdery scab, a root and tuber disease caused by the pathogen Spongospora subterranea f.sp. subterranea (Sss), poses a major problem to potato producers worldwide because it affects potato quality. Inoculum can be ...
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Muzhinji, Norman; Dube, Joel Prince; De Haan, E.G.; Woodhall, J.W.; Van der Waals, Jacqueline Elise (Springer, 2020-10)Pectobacterium brasiliense (Pb) is one of the causal agents of soft rot and blackleg diseases and has become a pathogen of economic importance in many potato production regions worldwide. Accurate, sensitive and timely ...
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Ngadze, Elizabeth; Coutinho, Teresa A.; Icishahayo, David; Van der Waals, Jacqueline Elise (Elsevier, 2014-08)Nutrients such as boron, nitrogen and calcium stimulate the production of phenols. This research focuses on the role of calcium in increasing phenol metabolism in potato peels and the ensuing tuber resistance to soft rot ...
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Effect of irrigation on charcoal rot severity, yield loss and colonization of soybean and sunflower Jordaan, Estiene; Van der Waals, Jacqueline Elise; McLaren, Neal W. (Elsevier, 2019-08)Charcoal rot incidence in soybean and sunflower in South Africa is increasing. Irrigation as a means to manage charcoal rot is limited as water resources are decreasing and oil seed production is predominantly on dry land. ...
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Simango, Kenedy; Van der Waals, Jacqueline Elise (Springer, 2017-03)Powdery scab caused by Spongospora subterranea f. sp. subterranea (Sss) causes extensive losses in potato production systems globally. Two pot experiments were established in the greenhouse in summer 2013 and winter 2014 ...
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Kandolo, S.D.; Aveling, T.A.S. (Terry); Van der Waals, Jacqueline Elise; Truter, Mariëtte; Laurie, S.M. (International Society for Horticultural Science, 2018-06)Alternaria blight (AB) of sweet potato caused by Alternaria bataticola, is a limiting factor for sweet potato industries in various countries. The disease has been recently reported in South Africa. A thorough literature ...
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Muzhinji, Norman; Woodhall, J.W.; Truter, Mariëtte; Van der Waals, Jacqueline Elise (American Phytopathological Society, 2014-04)No Abstract
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Van der Waals, Jacqueline Elise; Kruger, Kerstin (AOSIS Open Journals, 2020-11-26)Potato is a staple crop that contributes to food security and poverty alleviation in developing nations. Despite this, yields in developing nations are often unsustainably low, due to various biotic and abiotic factors ...
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Uaciquete, A.; Korsten, Lise; Van der Waals, Jacqueline Elise (Elsevier, 2013-07)Anthracnose of cashew (Anacardium occidentale) was studies on various genotypes and locations in Mozambique. Colletotrichum gloeosporioides was identified as the anthracnose causal agent using polymerase chain reaction. ...
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Ramusi, Tshekgene M.; Van der Waals, Jacqueline Elise; Labuschagne, Nico; Aveling, T.A.S. (Terry) (Taylor and Francis, 2017)Cowpea (Vigna unguiculata) is susceptible to pathogens such as Rhizoctonia solani Pythium ultimum and Fusarium solani causing seedling diseases in cowpea, resulting in low yields. Three commercial synthetic fungicides ...
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Van der Waals, Jacqueline Elise; Pitsi, B.E. (Boitumelo Elijah); Marais, C.; Wairuri, Charles K. (American Phytopathological Society, 2011-03)In recent growing seasons, a new leaf blight was observed on potatoes (Solanum tuberosum L.) in various production regions in South Africa. Symptoms were observed before early blight, from 50-60 days after emergence of the ...
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Muzhinji, Norman; Van der Waals, Jacqueline Elise; Woodhall, J.W.; Truter, Mariëtte (American Phytopathological Society, 2014-06)No abstract available.
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Ngadze, Elizabeth; Coutinho, Teresa A.; Van der Waals, Jacqueline Elise (American Phytopathological Society, 2010-10)A survey was carried out in the potato- (Solarium tuberosum L.) growing regions of Zimbabwe in April 2009 to assess the prevalence of bacterial soft rot. A total of 125 tubers with soft rot symptoms were collected. The ...
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Coutinho, Teresa A.; Wingfield, Michael J.; Oberholster, Anna-Maria; Berger, David Kenneth; Kunert, Karl J.; Marais, Gert; Labuschagne, Nico; Korsten, Lise; Aveling, T.A.S. (Terry); Van der Waals, Jacqueline Elise; Steenkamp, Emma Theodora; Myburg, Alexander Andrew; Viljoen, Altus; Viljoen, Altus; Van den Berg, Noelani; Roux, Jolanda; Myburg, Zander; Chikwamba, R.K. (Rachel Kerina); University of Pretoria. FABI; University of Pretoria. Forestry and Agricultural Biotechnology Institute (Forestry and Agricultural Biotechnology Institute, University of Pretoria, 2005)
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Van der Waals, Jacqueline Elise; Steyn, J.M. (Joachim Marthinus), 1963-; Franke, A.C.; Haverkort, A.J. (Anton) (Elsevier, 2016-06)Growers’ surveys took place in all sixteen potato growing regions of South Africa in 2013 and 2014. The agro-ecological climate of these regions is diverse and potato is produced in rainy or dry seasons, in winter or ...
Now showing items 1-20 of 40