Write a well-detailed scientific paragraph and paraphrase the following; Chemical control should only be used as a last resort since it is hazardous for natural vegetation. It should not be necessary if regular monitoring is undertaken, which should b

Chemical control of invasive species should only be employed as a last measure due to its potential dangers to native flora. Effective management of invasive alien plants typically should not necessitate chemical interventions if regular monitoring practices are consistently applied. This chemical control involves the application of registered herbicides aimed at eradicating the targeted weeds. It is essential for both managers and herbicide applicators to possess a foundational understanding of herbicide mechanisms to avoid misapplications. Utilizing inappropriate herbicides, or even the correct ones improperly, can lead to wastage and elevated costs, while also causing significant ecological damage, particularly near water bodies where contamination risks are heightened. Certain herbicides are capable of swiftly polluting freshwater sources and may spread downstream, remaining biologically active in the ecosystem. Furthermore, contractors applying herbicides must hold a permit under the Fertilizer, Farm Feeds, Agricultural Remedies and Stock Remedies Act (Act No. 36 of 1947). Herbicides are categorized into selective and non-selective types; selective herbicides target specific plant groups, like broadleaf plants, without harming narrow-leaf plants such as grasses, while non-selective herbicides indiscriminately destroy any plant they contact, making them unsuitable for use where native vegetation exists. The methods for chemical application include foliar (leaf) application, various stem application techniques (such as basal stem, total frill, and stem injections), and stump treatments (including cut stump, total stump, and scrape and paint methods). **Paraphrased Version:** The use of chemical control for managing invasive species should be considered a last resort due to its risks to native plant life. With diligent monitoring, there should usually be no need for chemical means to handle invasive alien plants. Chemical control consists of applying registered herbicides targeted at specific weeds. It is crucial for those managing and applying herbicides to have a basic understanding of their operational principles, as using the wrong types or misapplying the right types of herbicides can waste resources, incur high costs, and often result in negative environmental impacts, particularly in proximity to water bodies. Some herbicides can rapidly contaminate freshwater and may move downstream while remaining active in the ecosystem. Additionally, herbicide applicators must obtain a permit as stipulated by the Fertilizer, Farm Feeds, Agricultural Remedies and Stock Remedies Act (Act No. 36 of 1947). Herbicides are divided into selective and non-selective categories; selective herbicides are designed to affect specific plant groups, such as broadleaf species, while sparing narrow-leaved plants like grasses. Conversely, non-selective herbicides can damage any vegetation they encounter, making them inappropriate for areas with indigenous plant life. Methods of application for these chemicals include treating the leaves (foliar application), various strategies for application to the stem (like basal stem, total frill, and stem injections), and methods for treating stumps (such as cut stump, total stump, and scrape and paint procedures).