The gypsy moth, an insect brought from Europe to the United States over a century ago, has become the most serious leaf-feeding forest pest in the eastern United States. This packet of instructional materials tells the teacher how to encourage students to explore a biological problem and its impact on society and the environment. It introduces the world of entomology, demonstrates why and how one insect can have such a profound impact on the urban and natural forest environment, and suggests how the effects of the gypsy moth can be minimized through sound management practices. More than 50 activities in this guide cover a broad range of topics including the abundance and diversity of insects, insect classification and identification, urban and natural forest ecology, and integrated pest management. Each section begins with an introduction that clarifies the importance of the section and provides background information. Sections can be used independently of each other. (CW)