The first report of selected herbicides and fungicides in water and fish from a highly utilized and polluted freshwater urban impoundment

Barnhoorn, I.E.J.; Dyk, Cobus van

doi:10.1007/s11356-020-09930-7

Cited by 17 publications

(9 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[8][9][10] However, longterm and indiscriminate use of chemical synthetic fungicides has further and more serious disadvantages, such as environmental pollution, human health issues, and resistance strains of the pathogen. [11][12][13][14] In view of these problems, many scholars are exploring natural, safe, and effective potential antifungal substances that can replace synthetic fungicides. [15][16][17][18] In recent years, plant metabolites with antifungal properties have attracted increasing attention because of their natural biodegradation and low toxicity to humans and animals.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the polypharmacology of a natural antifungal product, eugenol, against Rhizoctonia solani

Zhao

Wang

et al. 2021

Pest Management Science

View full text Add to dashboard Cite

BACKGROUND: Rice sheath blight caused by Rhizoctonia solani is a devastating disease of rice in China. However, indiscriminate use of chemical fungicides applied to control the disease raise major environmental and food safety issues. Ecofriendly biocontrol alternatives are urgently needed. Eugenol, one of the main ingredients in Syzygium aromaticum, has attracted much attention owing to its antifungal properties. However, its mode of action is still not clear. Herein, the antifungal activity and mode of action of eugenol against R. solani were investigated.RESULTS: Results confirmed that the mycelia of R. solani treated with eugenol shrank and became dehydrated, the cytoplasmic wall separated, and the vacuoles and mitochondria decreased or dissolved. Moreover, we found that eugenol downregulated expression of C-4 methyl sterol oxidase, inhibited synthesis of ergosterol, increased membrane permeability and impaired the transportation of amino acids and glucose across the cell membrane. In addition, eugenol decreased the mitochondrial membrane potential and initiated an oxidative stress reaction by increasing reactive oxygen species and malondialdehyde, which together with membrane damage contribute to the antifungal activity of eugenol. Meanwhile, eugenol might inhibit R. solani by affecting oxidative phosphorylation and the tricarboxylic acid cycle (TCA cycle). CONCLUSION: In view of its multitarget properties against R. solani, eugenol provides an alternative approach to chemical control strategies against rice sheath blight.

show abstract

Section: Introductionmentioning

confidence: 99%

Unraveling the polypharmacology of a natural antifungal product, eugenol, against Rhizoctonia solani

Zhao

Wang

et al. 2021

Pest Management Science

View full text Add to dashboard Cite

show abstract

“…In South Africa, significant concentrations of endosulfan, DDTs and other pesticides were reported to be present in Lourens River, Hex River, and Pongolo floodplain (Olisah et al, 2020). Barnhoorn and van Dyk (2020) also reported the occurrences of herbicides such as Dacthal, metribuzin, simazine, tebuthiuron, terbuthylazine, and the fungicides azoxystrobin, carbendazim, epoxiconazole, metalaxyl (Ridomil), propiconazole, pyrimethanil and thiabendazole in the Roodeplaat Dam of South Africa. Other studies conducted in Lake Bosomtwe and Lake Volta of Ghana, Tana and Sabaki of Kenya, Lake Victoria of Tanzania, Ogbese River of Nigeria, and Lake Ziway in the Ethiopian Rift Valley basin reported significant concentrations of pesticides in water and sediment samples (Merga et al, 2020;Olisah et al, 2020).…”

Section: Climate Change and The Wlf Security Nexus In Ssamentioning

confidence: 98%

“…Some studies have indicated how water depletion in freshwater ecosystems and wetlands impacts crop production, fishing, and livestock rearing present in SSA (Leauthaud et al, 2013). Others have shown how improper agricultural practices can impact land and water resources (Barnhoorn and van Dyk, 2020;Olisah et al, 2020). Agriculture is known to be a major source of food and livelihoods in many local communities in SSA.…”

Section: Climate Change and The Wlf Security Nexus In Ssamentioning

confidence: 99%

Climate Change, Land, Water, and Food Security: Perspectives From Sub-Saharan Africa

Ofori

Cobbina

Obiri

2021

Front. Sustain. Food Syst.

View full text Add to dashboard Cite

The current and projected warming of the earth is unequivocal with humans playing a strong role as both perpetrators and victims. The warming on the African continent is projected to be greater than the global average with an increased average temperature of 3–6°C by the end of the century under a high Representative Concentration Pathway. In Africa, the Sub-Saharan region is identified as the most vulnerable to the changing climate due to its very low capacity to adapt to or mitigate climate change. While it is common to identify studies conducted to assess how climate change independently impacts water, land, or food resources, very limited studies have sought to address the interlinkages, synergies, and trade-offs existing between climate change, water, land, and food (WLF) resources as a system in Sub-Saharan Africa (SSA). The climate change and WLF security nexus, therefore, seeks to address this shortfall in literature and subsequently serve as a relevant source of information for decision-making and policy implementation concerning climate change mitigation and adaptation. In this study, 41 relevant studies were selected from Web of Science, Google Scholar, ResearchGate, and institutional websites. We provide information on the independent relationships between climate change and WLF resources, and further discuss the existing inter-linkages between climate change and the WLF security in SSA using the nexus approach, with recommendations on how decision making and policy implementations should be done using the climate change and WLF security nexus approach.

show abstract

“…Since the geohydrological data showed no evidence of interaction between the surface- and groundwater, the study concluded that groundwater is being polluted by an unknown source. Recently, Barnhoorn and Van Dyk (2020) ( Table 1 ) were the first to report on the presence of certain triazine herbicides (including simazine, atrazine and terbuthylazine) in the freshwater impoundment of the Roodeplaat Dam. This water source supports several agricultural and residential activities that are most likely responsible for the pesticide contamination.…”

Section: The Threat Of Current-use Triazine Herbicidesmentioning

confidence: 99%

Agrochemicals in freshwater systems and their potential as endocrine disrupting chemicals: A South African context

Horak

Horn

Pieters

2021

Environmental Pollution

View full text Add to dashboard Cite

South Africa is the largest agrochemical user in sub-Saharan Africa, with over 3 000 registered pesticide products. Although they reduce crop losses, these chemicals reach non-target aquatic environments via leaching, spray drift or run-off. In this review, attention is paid to legacy and current-use pesticides reported in literature for the freshwater environment of South Africa and to the extent these are linked to endocrine disruption. Although banned, residues of many legacy organochlorine pesticides (endosulfan and dichlorodiphenyltrichloroethane (DDT)) are still detected in South African watercourses and wildlife. Several current-use pesticides (triazine herbicides, glyphosate-based herbicides, 2,4-dichlorophenoxyacetic acid (2,4-D) and chlorpyrifos) have also been reported. Agrochemicals can interfere with normal hormone function of non-target organism leading to various endocrine disrupting (ED) effects: intersex, reduced spermatogenesis, asymmetric urogenital papillae, testicular lesions and infertile eggs. Although studies investigating the occurrence of agrochemicals and/or ED effects in freshwater aquatic environments in South Africa have increased, few studies determined both the levels of agricultural pesticides present and associated ED effects. The majority of studies conducted are either laboratory-based employing in vitro or in vivo bioassays to determine ED effects of agrochemicals or studies that investigate environmental concentrations of pesticides. However, a combined approach of bioassays and chemical screening will provide a more comprehensive overview of agrochemical pollution of water systems in South Africa and the risks associated with long-term chronic exposure.

show abstract

The first report of selected herbicides and fungicides in water and fish from a highly utilized and polluted freshwater urban impoundment

Cited by 17 publications

References 26 publications

Unraveling the polypharmacology of a natural antifungal product, eugenol, against Rhizoctonia solani

Unraveling the polypharmacology of a natural antifungal product, eugenol, against Rhizoctonia solani

Climate Change, Land, Water, and Food Security: Perspectives From Sub-Saharan Africa

Agrochemicals in freshwater systems and their potential as endocrine disrupting chemicals: A South African context

Contact Info

Product

Resources

About