Private applicators are typically owners or employees of which of the following areas?

Private applicators are individuals who are typically involved in the application of pesticides or herbicides for agriculture or horticultural uses and they usually operate within their own or their employer's property. In the context of nursery greenhouses, private applicators often engage in pest management practices to protect plants from pests and diseases that can affect the growth and health of the plants they cultivate.

Nursery greenhouses require careful and controlled environments to grow plants effectively, and pest control is a critical element of maintaining plant health. Private applicators in this setting must be knowledgeable about the specific needs of various plants, appropriate pest control methods, and regulations surrounding pesticide use.

While urban areas, forests, and public parks also may involve pest management practices, the term "private applicator" specifically refers to individuals working in a private capacity rather than on public land or large unmanaged environments. Thus, the most fitting context for private applicators in this question is indeed in nursery greenhouses.