Which of the following best describes the control of weeds using mechanical methods?

The choice that best describes the control of weeds using mechanical methods is employing tools such as hoeing or mowing. Mechanical weed control involves physically removing or disrupting weeds through various physical actions or tools, rather than relying on chemical or biological means. Hoeing is a direct method to uproot weeds, while mowing can prevent weeds from flowering and seeding, thus reducing their population over time.

Other methods mentioned involve different approaches to weed management. Utilizing natural biological agents focuses on introducing organisms that target weed species, which falls under biological control rather than mechanical. Applying herbicides pertains to chemical control methods, and while effective, it does not involve mechanical action. Planting cover crops is a preventive measure that can suppress weeds but does not qualify as a mechanical control method in itself.