Sive Tokozwayo

Sorghum halepense is widely recognised as one of the most aggressive invasive perennial grasses affecting agricultural ecosystems worldwide. This systematic review synthesises existing scientific evidence on the ecological invasion dynamics, origin, distribution patterns, impacts on both biodiversity and livestock, and management strategies. A systematic literature review approach was employed to identify and evaluate peer-reviewed and grey literature. Relevant studies were retrieved from major scientific databases, including Google Scholar, PubMed, and ResearchGate, using predefined search terms related to S. halepense, invasion, impact on native plants and livestock, and possible control measures. Articles were screened based on relevance, methodological quality, and thematic alignment with the objectives of the review. The results showed that Johnsongrass is making a gradual invasion in South Africa through seed production and rhizome systems. Sorghum halepense alters native species composition, subsequently reduces biodiversity, and outcompetes native species. Although it may provide forage under certain conditions, its accumulation of cyanogenic compounds and nitrates poses serious poisoning risks to herbivores. Management strategies such as mechanical, burning, and chemical methods vary in terms of effectiveness. Some of these measures are influenced by the genetic make-up of the plant, costs associated with each control measure and other environmental factors. This review highlights the need for integrated management approaches that balance invasive weed control with sustainable forage production. This review emphasises the importance of adopting integrated management strategies that effectively control both seed production and underground stems. Future research should prioritise climate-responsive management approaches, improved understanding of invasion ecology, and the development of cost-effective control measures. Bringing together policy makers and specialists in weed science, natural conservation science, and animal health will be essential for reaching consensus on the actions required to curb the expansion and reduce the economic losses associated with the abundance of Sorghum halepense in our ecosystems.

Sorghum halepense (Johnsongrass) is widely recognised as one of the most aggressive invasive perennial grasses affecting agricultural and rangeland ecosystems worldwide. Its rapid spread, ecological adaptability, and dual role as both a potential forage resource and a toxic risk to livestock present complex challenges for sustainable livestock production. Despite extensive research on its ecology and management, existing knowledge remains fragmented across multiple disciplines, limiting the development of integrated control strategies. This systematic review synthesises existing scientific evidence on the ecological invasion dynamics, origin and distribution patterns, biodiversity impacts, livestock-related risks, and management strategies associated with S. halepense, intending to inform sustainable livestock production systems. A systematic literature review approach was employed to identify and evaluate peer-reviewed and grey literature. Relevant studies were retrieved from major scientific databases, including Google Scholar, PubMed, and ResearchGate, using predefined search terms related to S. halepense, invasion ecology, livestock toxicity, and weed management. Articles were screened based on relevance, methodological quality, and thematic alignment with the objectives of the review. The findings indicate that S. halepense has successfully invaded diverse agro-ecological regions due to its hybrid origin, polyploid genome structure, prolific seed production, and extensive rhizome system. The species significantly alters plant community composition, reduces biodiversity, and competes with crops and native forage species. Although it may provide forage under certain conditions, its accumulation of cyanogenic compounds and nitrates poses serious poisoning risks to grazing livestock. Current control strategies, including mechanical removal, cultural practices, herbicide application, and prescribed burning, vary in effectiveness and are often limited by ecological constraints, cost, and the increasing emergence of herbicide resistance. The review highlights the need for integrated, ecosystem-based management strategies that balance invasive weed control with sustainable forage production. Future research should prioritise climate-responsive management approaches, improved understanding of invasion ecology, and the development of cost-effective control measures suitable for livestock production systems. A multidisciplinary framework integrating weed science, rangeland ecology, and animal health will be critical for mitigating the ecological and economic impacts of S. halepense in invaded landscapes.

Background and Aim: Sheep scab is one of the most contagious diseases of sheep found in rural communities worldwide and is a major health and welfare concern for sheep farming. Information on the attitudes of communal farmers to sheep scab remains speculative in the Eastern Cape Province. This study aimed to investigate knowledge, attitudes, and practices related to the prevalence of sheep scab among communal sheep farmers in Eastern Cape Province, South Africa. Materials and Methods: From June to August 2022, a cross-sectional survey using a semi-structured questionnaire (n = 160) was conducted in two rural communities of the Enoch Mgijima Local Municipality in Eastern Cape Province. Purpose sampling was used to obtain respondents’ knowledge, attitudes, and management practices regarding sheep scabs. Results: Among respondents, 81% were males and 19% were females. The majority of sheep farmers (59%) in both communities were aware of sheep scabs, but the majority (64%) did not receive any farming training. The majority of sheep farmers (65%) believed that sheep scab was the most serious threat to their sheep production since it increased mortality. In the past 3 years, approximately 57% of respondents reported an increase in the prevalence of sheep scab. The majority of farmers reported wool loss as the most noticeable clinical symptom (73%). More than 80% of sheep farmers do not use acaricide on a regular basis. Sixty-one percent of farmers prefer a pour-on topical application method. The frequency of annual dipping was every fortnight (40%), during summer and winter (24%). Most farmers (66%) regularly vaccinate their sheep. Conclusion: The prevalence of sheep scab is increasing in these communities; however, a better understanding of the factors that facilitate its transmission is required to allow improved management and control of this disease. The government must involve extension officers and distribute them to disseminate information to farmers. Thus, it will be easy to translate the literature into action. Keywords: communal sheep farmers, Eastern Cape Province, season, sheep scab control methods, sheep scab.

With the world’s population growing at an alarming rate, there is an urgent need to improve food security. This study aimed to assess forage dry matter yield and plant density under different herbicide treatments at Kubedlana arable lands. The study was carried out using eight treatments consisting of seven herbicide treatments and a control. Seed mixtures of seven legume species were broadcasted in 24 plots of 3 m × 5 m size. Herbicide treatments including Bendioxide (BEN), Glyphosate (GLY), Haloxyfop-R methyl (HAL), Haloxyfop-R methyl and Bendioxide (HBE), Paraquat (PAR), Bendioxide (BRR), and Paraquat (PRR) were applied individually in three plots. Dry matter production and plant densities were determined in five randomly distributed 0.25 m² quadrats per plot. The results revealed that GLY had a significantly (p < 0.05) higher effect on the DM yield compared with other treatments. Both BRR and HBE significantly (p < 0.05) decreased the DM yield. GLY and HBE significantly reduced (p < 0.05) the grass density in 2017 and BRR significantly affected (p < 0.05) the legume density in May 2017 and May 2018, respectively. These results indicate that the application of GlY and HAL resulted in the reduction of grass density. Furthermore, none of the applied chemicals negatively influenced the legume density.

The study was conducted in Alice, Eastern Cape Province, South Africa. The objective of this study was to evaluate farmers’ perceptions on the impact of Vachellia karroo encroachment on livestock production and vegetation. Forty farmers (62% females and 38% males) were interviewed using semi-structured questionnaires. The results showed that goats and cattle were mainly kept for cash sales and sheep for wool production. Shortage of forage and lack of water points were the main constraints to livestock production, especially during dry season. Cattle and sheep owners perceived that V. karroo encroachment had a negative impact on grazer production, as it reduces the grazing capacity of the veld. Goat owners viewed V. karroo as an acceptable tree to goats and its abundance favors browsers as compared to grazers. Although farmers have different views concerning the impact of V. karroo encroachment. The mean of livestock composition showed that goats (11.6±1.3) are more favoured by the veld condition compared to cattle (4.9± 1.1) and sheep (2.6±0.7). This study concludes that V. karroo have a negative impact on grazer’s production, sheep and cattle owners observed V. karroo encroachment as a form of land degradation. Pastoralists recommended that veld burning and bush clearing can be used to mitigate encroachment. Key words: Encroachment, degradation, livestock composition, Vachellia karroo.