What method is recommended for controlling limited infestations of weeds due to its lower environmental impact?

Mechanical control is recommended for managing limited infestations of weeds because it involves physical removal or destruction of the weeds using tools or machinery, which typically has a lesser impact on the surrounding environment. This method helps maintain soil health and biodiversity, as it does not introduce potentially harmful chemicals or alter the chemical composition of the soil like chemical control might. Additionally, mechanical methods can be targeted specifically at the weeds, reducing the risk of harming beneficial plants and organisms within the ecosystem.

Sanitation can reduce the spread of weed seeds but doesn't directly control existing infestations. Controlled burning may effectively manage weeds in certain scenarios but can also pose environmental risks if not conducted properly. Chemical control, while effective in many situations, carries the potential for broader ecological impact due to the use of herbicides, which can affect non-target species and lead to soil and water contamination. Therefore, mechanical control stands out as a more environmentally friendly option for tackling limited weed infestations.