A physical control method in managing vegetation could include which of the following?

Using machinery to remove plant material is a physical control method in managing vegetation because it involves direct mechanical intervention to eliminate or manage unwanted plants. This can include various techniques such as mowing, cutting, or using specialized equipment to uproot or chop down vegetation. Physical control methods are tangible and often immediate, allowing for management of the plant population without introducing any chemicals or biological agents.

In contrast, chemical sprays involve the application of herbicides or pesticides, which do not fall under physical control as they are chemical management strategies. Encouraging natural predation pertains to biological control, where natural predators are utilized to manage plant populations, rather than physically removing them. Selective watering involves hydrological manipulation and is more about resource management than direct physical removal of vegetation.