scholarly journals First Report of Maize streak virus Field Infection of Sugarcane in South Africa

Plant Disease ◽  
2008 ◽  
Vol 92 (6) ◽  
pp. 982-982 ◽  
Author(s):  
T. van Antwerpen ◽  
S. A. McFarlane ◽  
G. F. Buchanan ◽  
D. N. Shepherd ◽  
D. P. Martin ◽  
...  
Keyword(s):  
South Africa ◽  
South African ◽  
Southern Africa ◽  
Maize Streak Virus ◽  
Streak Virus ◽  
Yield Losses ◽  
The South ◽  
Sugarcane Cultivar ◽  
First Report ◽  
The Impact

Prior to the introduction of highly resistant sugarcane varieties, Sugarcane streak virus (SSV) caused serious sugar yield losses in southern Africa. Recently, sugarcane plants with streak symptoms have been identified across South Africa. Unlike the characteristic fine stippling and streaking of SSV, the symptoms resembled the broader, elongated chlorotic lesions commonly observed in wild grasses infected with the related Maize streak virus (MSV). Importantly, these symptoms have been reported on a newly released South African sugarcane cultivar, N44 (resistant to SSV). Following a first report from southern KwaZulu-Natal, South Africa in February 2006, a survey in May 2007 identified numerous plants with identical symptoms in fields of cvs. N44, N27, and N36 across the entire South African sugarcane-growing region. Between 0.04 and 1.6% of the plants in infected fields had streak symptoms. Wild grass species with similar streaking symptoms were observed adjacent to one of these fields. Potted stalks collected from infected N44 plants germinated in a glasshouse exhibited streak symptoms within 10 days. Virus genomes were isolated and sequenced from a symptomatic N44 and Urochloa plantaginea plants collected from one of the surveyed fields (1). Phylogenetic analysis determined that while viruses from both plants closely resembled the South African maize-adapted MSV strain, MSV-A4 (>98.5% genome-wide sequence identity), they were only very distantly related to SSV (~65% identity; MSV-Sasri_S: EU152254; MSV-Sasri_G: EU152255). To our knowledge, this is the first confirmed report of maize-adapted MSV variants in sugarcane. In the 1980s, “MSV strains” were serologically identified in sugarcane plants exhibiting streak symptoms in Reunion and Mauritius, but these were not genetically characterized (2,3). There have been no subsequent reports on the impact of such MSV infections on sugarcane cultivation on these islands. Also, at least five MSV strains have now been described, only one of which, MSV-A, causes significant disease in maize and it is unknown which strain was responsible for sugarcane diseases on these islands in the 1980s (2,3). MSV-A infections could have serious implications for the South African sugar industry. Besides yield losses in infected plants due to stunting and reduced photosynthesis, the virus could be considerably more difficult to control than it is in maize because sugarcane is vegetatively propagated and individual plants remain within fields for years rather than months. Moreover, there is a large MSV-A reservoir in maize and other grasses everywhere sugarcane is grown in southern Africa. References: (1) B. E. Owor et al. J Virol. Methods 140:100, 2007. (2) M. S. Pinner and P. G. Markham. J. Gen. Virol. 71:1635, 1990. (3) M. S. Pinner et al. Plant Pathol. 37:74, 1998.

The impact of climate temperature on counts, recovery, and death rates due to SARS-CoV-2 in South Africa. (Preprint)

2020 ◽  
Author(s):  
Neven Chetty ◽  
Bamise Adeleye ◽  
Abiola Olawale Ilori
Keyword(s):  
South Africa ◽  
South African ◽  
Death Rate ◽  
Western Cape ◽  
Warm Climate ◽  
The South ◽  
Recovery Rates ◽  
Death Rates ◽  
Online Resource ◽  
The Impact

BACKGROUND The impact of climate temperature on the counts (number of positive COVID-19 cases reported), recovery, and death rates of COVID-19 cases in South Africa's nine provinces was investigated. The data for confirmed cases of COVID-19 were collected for March 25 and June 30, 2020 (14 weeks) from South Africa's Government COVID-19 online resource, while the daily provincial climate temperatures were collected from the website of the South African Weather Service. Our result indicates that a higher or lower climate temperature does not prevent or delay the spread and death rates but shows significant positive impacts on the recovery rates of COVID-19 patients. Thus, it indicates that the climate temperature is unlikely to impose a strict limit on the spread of COVID-19. There is no correlation between the cases and death rates, an indicator that no particular temperature range is closely associated with a faster or slower death rate of COVID-19 patients. As evidence from our study, a warm climate temperature can only increase the recovery rate of COVID-19 patients, ultimately impacting the death and active case rates and freeing up resources quicker to enable health facilities to deal with those patients' climbing rates who need treatment. OBJECTIVE This study aims to investigate the impact of climate temperature variation on the counts, recovery, and death rates of COVID-19 cases in all South Africa's provinces. The findings were compared with those of countries with comparable climate temperature values. METHODS The data for confirmed cases of COVID-19 were collected for March 25 and June 30 (14 weeks) for South African provinces, including daily counts, death, and recovery rates. The dates were grouped into two, wherein weeks 1-5 represent the periods of total lockdown to contain the spread of COVID-19 in South Africa. Weeks 6-14 are periods where the lockdown was eased to various levels 4 and 3. The daily information of COVID-19 count, death, and recovery was obtained from South Africa's Government COVID-19 online resource (https://sacoronavirus.co.za). Daily provincial climate temperatures were collected from the website of the South African Weather Service (https://www.weathersa.co.za). The provinces of South Africa are Eastern Cape, Western Cape, Northern Cape, Limpopo, Northwest, Mpumalanga, Free State, KwaZulu-Natal, Western Cape, and Gauteng. Weekly consideration was given to the daily climate temperature (average minimum and maximum). The recorded values were considered, respectively, to be in the ratio of death-to-count (D/C) and recovery-to-count (R/C). Descriptive statistics were performed for all the data collected for this study. The analyses were performed using the Person’s bivariate correlation to analyze the association between climate temperature, death-to-count, and recovery-to-count ratios of COVID-19. RESULTS The results showed that higher climate temperatures aren't essential to avoid the COVID-19 from being spread. The present results conform to the reports that suggested that COVID-19 is unlike the seasonal flu, which does dissipate as the climate temperature rises [17]. Accordingly, the ratio of counts and death-to-count cannot be concluded to be influenced by variations in the climate temperatures within the study areas. CONCLUSIONS The study investigates the impact of climate temperature on the counts, recovery, and death rates of COVID-19 cases in all South Africa's provinces. The findings were compared with those of countries with comparable climate temperatures as South Africa. Our result indicates that a higher or lower climate temperature does not prevent or delay the spread and death rates but shows significant positive impacts on the recovery rates of COVID-19 patients. Warm climate temperatures seem not to restrict the spread of the COVID-19 as the count rate was substantial at every climate temperatures. Thus, it indicates that the climate temperature is unlikely to impose a strict limit on the spread of COVID-19. There is no correlation between the cases and death rates, an indicator that there is no particular temperature range of the climatic conditions closely associated with a faster or slower death rate of COVID-19 patients. However, other shortcomings in this study's process should not be ignored. Some other factors may have contributed to recovery rates, such as the South African government's timely intervention to announce a national lockout at the early stage of the outbreak, the availability of intensive medical care, and social distancing effects. Nevertheless, this study shows that a warm climate temperature can only help COVID-19 patients recover more quickly, thereby having huge impacts on the death and active case rates.

scholarly journals First Report of Leaf Rust of Blueberry Caused by Thekopsora minima on Vaccinium corymbosum in the Western Cape, South Africa

Plant Disease ◽  
2010 ◽  
Vol 94 (4) ◽  
pp. 478-478 ◽  
Author(s):  
L. Mostert ◽  
W. Bester ◽  
T. Jensen ◽  
S. Coertze ◽  
A. van Hoorn ◽  
...  
Keyword(s):  
South Africa ◽  
South African ◽  
Water Solution ◽  
Phylogenetic Analyses ◽  
The United States ◽  
Vaccinium Corymbosum ◽  
Tween 20 ◽  
Western Cape ◽  
The South ◽  
First Report

Southern highbush blueberry plants (Vaccinium corymbosum interspecific hybrids) showing rust-like symptoms were observed in July 2006 in Porterville in the Western Cape (WC), South Africa. Diseased plants were also found in Villiersdorp and George in the WC in 2007. In 2008, symptoms were observed in George, and in 2009, in all the previous reported areas. Cvs. Bluecrisp, Emerald, Jewel, Sharpblue, and Star were infected. Reddish-to-brown spots appeared on the adaxial surface of leaves and developed into yellow-to-orange erumpent uredinia with pulverulent urediniospores. Uredinia were hypophyllous, dome shaped, 113 to 750 μm wide, and occasionally coalescing. Urediniospores were broadly obovate, sometimes ellipsoidal or pyriform, with yellowish orange content, and measured 19 to 27 × 12 to 20 μm (average 24 × 15 μm, n = 30). Spore walls were echinulate, hyaline, 1 to 1.5 μm thick, and with obscure germ pores. No telia or teliospores were observed. Voucher specimens were lodged in the South African National Fungus Collection in Pretoria (PREM 60245). The isolate was initially identified as Thekopsora minima P. Syd. & Syd., based primarily on the absence of conspicuous ostiolar cells characteristic of Naohidemyces spp. (3). Genomic DNA was extracted from urediniospores. Approximately 1,400 bp were amplified spanning the 5.8S, ITS2, and 28S large subunit of the ribosomal DNA (1). The sequence (GU355675) shared 96% (907 of 942 bp; GenBank AF522180) and 94% (1,014 of 1,047 bp; GenBank DQ354563) similarities in the 28S portion, respectively, to those of Naohidemyces vaccinii (Wint.) Sato, Katsuya et Y. Hiratsuka and Pucciniastrum geoppertianum (Kuehn) Kleb, two of the three known rust species of blueberry (2). Although no sequences of T. minima were available for direct comparison, phylogenetic analyses of the 28S region strongly supported the South African blueberry rust as congeneric with T. guttata (J. Schröt.) P. Syd. & Syd. (GenBank AF426231) and T. symphyti (Bubák) Berndt (GenBank AF26230) (data not shown). Four 6-month-old cv. Sharpblue plants were inoculated with a suspension (approximate final concentration of 1 × 105 spores per ml) of fresh urediniospores in a water solution with 0.05% Tween 20. After incubation at 20°C for 48 h under continuous fluorescent lighting, the plants were grown in a glasshouse (18/25°C night/day temperatures). Identical uredinia and symptoms developed approximately 3 weeks after inoculation on the inoculated plants, but not on two control plants of cv. Sharpblue sprayed with distilled water and kept at the same conditions. The alternate host hemlock (Tsuga spp.) is not endemic to South Africa and not sold as an ornamental plant according to a large conifer nursery. Hosts of T. minima include Gaylussacia baccata, G. frondosa, Lyonia neziki, Menziesia pilosa, Rhododendron canadense, R. canescens, R. lutescens R. ponticum, R. prunifolium, R. viscosum, V. angustifolium var. laevifolium, V. corumbosum, and V. erythrocarpon (3). Visual inspection of possible hosts in the gardens in close proximity of Vaccinium production areas did not show any rust symptoms. To our knowledge, this is the first report of T. minima on blueberries outside of Asia and the United States (2). References: (1) M. C. Aime. Mycoscience 47:112, 2006. (2) D. F. Farr and A. Y. Rossman. Fungal Databases. Systematic Botany and Mycology Laboratory. Online publication. USDA-ARS, 2009. (3) S. Sato et al. Trans. Mycol. Soc. Jpn. 34:47, 1993.

scholarly journals The impact of the credit legislation on consumers

2016 ◽  
Vol 6 (4) ◽  
pp. 503-509 ◽  
Author(s):  
Hlako Choma ◽  
Thifulufhelwi Cedric Tshidada ◽  
Tshegofatso Kgarabjang
Keyword(s):  
South Africa ◽  
South African ◽  
Consumer Protection ◽  
The Other ◽  
The South ◽  
Other Hand ◽  
Credit Agreement ◽  
Financial Obligation ◽  
The Impact ◽  
National Credit Act

The purpose of this paper is to examine two South Africa legislations dealing with over indebtedness of a consumer. It is clear that in terms of the South African law, section 129 (1) and 130 (3) of the National Credit Act provide that a creditor provider who wishes to enforce a debt under a credit agreement must first issue a section 129 (1) (a) notice to the consumer (the purpose of the notice is to notify the consumer of his/her arrears). On the other hand, the South African National Credit Act encourages the consumers to fulfil the financial obligations for which they are responsible. The second legislation to be examined which serve or appear to serve same purpose as the National Credit Act is the Insolvency Act. It therefore, postulated that the compulsory sequestration of a consumer in terms of the Insolvency Act would stand as an alternative remedy for a credit provider before she/he can have recourse mechanisms, such as debt review that are focused on satisfaction of the consumer’s financial obligation , in terms of the provisions of the National Credit Act. The paper determines to what extend these measures comply with the constitutional consumer protection demands. The legislature had been pertinently cognizant of the Insolvency Act when it lately enacted the National Credit Act. This is much apparent from the express amendment of section 84 of the Insolvency Act to the extent set out in schedule 2 of the National Credit Act

scholarly journals Depression in the South African workplace

2016 ◽  
Vol 22 (1) ◽  
pp. 2
Author(s):  
Marthinus P. Stander ◽  
Margreet Bergh ◽  
Helen Elizabeth Miller-Janson ◽  
Janetta C. De Beer ◽  
Frans A. Korb
Keyword(s):  
South Africa ◽  
Work Environment ◽  
South African ◽  
Depression And Anxiety ◽  
The South ◽  
Anxiety Group ◽  
Prevalence Of Depression ◽  
The Individual ◽  
The Impact ◽  
Insight Into

Depression is a common psychiatric disorder and can be costly, having a significant impact on the individual and employers. The South African Depression and Anxiety Group (SADAG) in partnership with HEXOR, with the support of Lundbeck, undertook research into depression in the workplace, because South African information is not available on this topic. It provides insight into the prevalence of depression within the workplace in South Africa, as well as the impact of depression on the employees and employers in terms of sick leave and levels of productivity, especially when the symptoms include cognitive impairment. It is apparent that stigma plays a pivotal role in the reasons for non-disclosure to employers. It further highlights the magnitude of awareness, early detection and the provision of a holistic support system within the work environment, free from bias, to ensure that optimum benefit can be achieved for both employer and employee.

scholarly journals The Impact of Productivity, Investment and Real Wages on Employment Absorption Rate in South Africa

2019 ◽  
Vol 8 (12) ◽  
pp. 330 ◽  
Author(s):  
Thomas Habanabakize ◽  
Daniel Francois Meyer ◽  
Judit Oláh
Keyword(s):  
South Africa ◽  
South African ◽  
Absorption Rate ◽  
Labour Productivity ◽  
Series Data ◽  
The South ◽  
Real Wages ◽  
Long Run ◽  
Investment Spending ◽  
The Impact

Many developing countries are facing high levels of unemployment and most people who are employed are poorly remunerated due to low skills and productivity levels. Although jobs are important, a productive job is even more important, not only for employees, but also for employers. South Africa, being a developing country, is also facing the challenge of dramatically high levels of unemployment. This study’s aim was to examine both the short- and long-term impacts of real wages, labour productivity and investment spending on employment absorption rates in South Africa. To establish the existing relationship between variables, the study applied several econometric approaches, such as an autoregressive distributed lag (ARDL) model, error correction model (ECM) and a Toda–Yamamoto causality analysis on quarterly time series data from 1995Q1 to 2019Q1. The results revealed the existence of both short- and long-run relationships among the variables. While a positive relationship was found between employment absorption, investment spending and labour productivity, it was found that real wages negatively impact on long-run employment absorption rates. Additionally, the short-run analysis indicated that the lagged employment absorption rate influences the current rate of employment. Furthermore, the causality tests indicated that a bi-directional causal relationship exists between employment absorption and investment spending; and a uni-directional relationship between employment and both real wages and labour productivity. Based on the findings, the study recommends increments of investment spending and labour productivity that enables the South African economy to carry out more activities that would require more workers, thereby improving the employment absorption rate. The fact that labour productivity positively impacts the employment absorption rate infers the requirement for quality and skilled workers to be absorbed in the South African labour market. Therefore, labour skills improvements appear to be a prerequisite for productivity enhancement and job creation.

Dynamic topography controls on source-to-sink systems: Example of the last 40 Ma in South Africa.

2020 ◽  
Author(s):  
Claire Mallard ◽  
Tristan Salles ◽  
Sabin Zahirovic ◽  
Xuesong Ding
Keyword(s):  
South Africa ◽  
South African ◽  
Surface Processes ◽  
Source Surface ◽  
Mantle Flow ◽  
Dynamic Topography ◽  
The South ◽  
Geological Record ◽  
Source To Sink ◽  
The Impact

<p>Over deep time, mantle flow-induced dynamic topography drives deposition moderated by higher-frequency fluctuations in climate and sea level. The effects of deep mantle convection impact all the segment of the source to sink systems at different wavelengths and over various scales which remains poorly quantified. Field observations and numerical investigations suggest that the long-term stratigraphic record along continental margins contains essential clues on the interactions between dynamic topography and surface processes. However, it remains challenging to isolate the fingerprints of dynamic topography in the geological record.</p><p>We use the open-source surface evolution code Badlands (badlands.readthedocs.io), to quantify the impact of different timings and wavelengths of dynamic topography migration on the South African landscape responses.</p><p>We test three different dynamic topography scenarios obtained by both backwards advection and forwards modelling of mantle flow. We investigate their influence on landscape dynamics, stratal geometries and depositional patterns of South Africa over the past 40 Ma. We compare the evolution of the drainage organization, sediments flux, and stratigraphy obtained with the models with seismic, geochronological, and thermochronological data. We demonstrate that inland incision, spatial sediment accumulation, and depocenter migration strongly depend on the direction of sediment transport relative to the direction of dynamic topography propagation. It allows to identify realistic evolutions of mantle flow associated with the South African uplift history. Our results suggest that our source-to-sink numerical workflow can be used to explore, in a systematic way, the interplay between dynamic topography and surface processes and can provide insights into recognizing the geomorphic and stratigraphic signals of dynamic topography in the geological record.</p>

scholarly journals NEAR DEATH IN THE STREETS OF KARIBIB: FAMINE, MIGRANT LABOUR AND THE COMING OF OVAMBO TO CENTRAL NAMIBIA

2003 ◽  
Vol 44 (2) ◽  
pp. 211-239 ◽  
Author(s):  
JAN-BART GEWALD
Keyword(s):  
South Africa ◽  
South African ◽  
World War ◽  
The South ◽  
The First World War ◽  
Military Administration ◽  
South West Africa ◽  
And Migration ◽  
The Impact ◽  
First World

Namibian politics and society are today dominated by people who trace their descent from the settlements and homesteads of Ovamboland in southern Angola and northern Namibia. Yet, prior to 1915, and the defeat by South Africa of the German colonial army in German South-West Africa, very few Ovambo had settled in areas to the south of the Etosha Pan. In 1915, a Portuguese expeditionary army defeated Kwanyama forces in southern Angola, and unleashed a flood of refugees into northern Namibia. These refugees entered an area that was already overstretched. Since 1912 the rains had failed and, on account of the First World War, trade and migration had come to a standstill. As a result the area was experiencing its most devastating famine ever. Unable to find sanctuary in Ovamboland, thousands of people trekked southwards into central Namibia, an area which had only just come under the control of South Africa. The famine allowed for the easy entrance of South African military administrators and labour recruiters into Ovamboland and heralded the demise of Ovambo independence. By focusing on developments in the central Namibian town of Karibib between 1915 to 1916, the article explores the move of the Ovambo into central and southern Namibia. It traces the impact of war and drought on Ovambo societies, and follows Ovambo famine migrants on their route south into areas administered by the South African military administration. Discussion also concentrates on the reception and treatment of Ovambo famine migrants in the Karibib settlement, and argues that the refugee crisis heralded the establishment of Ovambo in modern central and southern Namibia.

scholarly journals The impact on the South African economy of alternative regulatory arrangements in the petroleum sector

2020 ◽  
Author(s):  
Heinrich Bohlmann ◽  
Rod Crompton
Keyword(s):  
South Africa ◽  
South African ◽  
Computable General Equilibrium ◽  
Impact Analysis ◽  
Computable General Equilibrium Model ◽  
The South ◽  
Real Wages ◽  
Fuel Price ◽  
Parity Price ◽  
The Impact

This paper adds quantitative analysis to the study by Crompton et al. (2020), in which various alternative regulatory arrangements regarding the petrol price in South Africa were explored. We use a multi-sector dynamic computable general equilibrium model for South Africa to conduct our economic impact analysis. Five scenarios are modelled, first individually to correctly calibrate the shocks, and then cumulatively to find the overall economy-wide effects of the proposed reforms. Under the most comprehensive set of reforms to the determination of petrol prices, which seeks to emulate market forces, the South African economy is seeing substantial benefits. GDP is expected to rise by 0.67 per cent and real wages by over 1.1 per cent relative to the baseline. Refineries are assumed to shrug off reforms targeted at removing pure profits earned via the import parity price (Basic Fuel Price) methodology by accepting a slightly lower rate of return, enabling them to meet the expected increase in demand for petrol on the back of the lower consumer prices achieved via the reforms. Whilst job losses at fuel service stations may be expected as a result of reduced revenues and margins, increased activity and job opportunities in the rest of the economy, facilitated through cheaper trade and transport margins, will more than offset those losses.

scholarly journals Helminths in South Africa: management of cestode and trematode infections in humans

2020 ◽  
pp. 33-38
Author(s):  
RL van Zyl
Keyword(s):  
South Africa ◽  
South African ◽  
Age Groups ◽  
Signs And Symptoms ◽  
Epidemiological Data ◽  
Sub Saharan Africa ◽  
The South ◽  
Increased Risk ◽  
Sub Saharan ◽  
The Impact

Sub-Saharan Africa has to contend with many challenges, including inadequate healthcare systems, lack of optimal sanitation, and clean water and food. All of these contribute to malnutrition and an increased risk of infections, including parasitism by cestodes and trematodes. Schistosomiasis is a category-2 notifiable trematode (fluke) infection, whereas cestode (tapeworm) infections need not be reported to the South African Department of Health. Epidemiological data for helminthiasis in South Africa is scant, with a paucity of publications on the South African scenario. As such, a complete picture of the impact of helminth infections on all age groups in South Africa does not exist. These parasitic diseases not only have an impact on socio economic development of a country, community and families, but also contribute to the chronic and detrimental effects on the health and nutritional status of the host, including the impaired development of children. In order to break the cycle of poverty and disease, a strong education drive is required in schools and communities to provide effective strategies and guidelines on preventative measures that result in avoidance of exposure to infective stages of Schistosoma and Taenia tapeworms. Also, it is imperative that healthcare professionals are able to recognise the signs and symptoms, so that interventions can be promptly initiated. The current anthelmintic treatments available in South Africa are effective against cestodes and trematodes, with no drug resistance having being reported. The need for compliancy when taking anthelmintic drugs must be emphasised.

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