The use of pathogens to control dodder weeds is an example of a biological method. Biological methods involve the use of living organisms or their products to control pests or weeds. In this case, pathogens (microscopic organisms that cause diseases) are used to infect and kill the dodder weeds, which are parasitic plants that attach themselves to host plants and compete for nutrients. This method is considered to be an environmentally friendly and sustainable way of controlling weeds, as it does not involve the use of synthetic chemicals that can harm the environment or human health.