The introduction on the first page of the Gallery was written by Faith T. Campbell, The Nature Conservancy.

The Nature Conservancy's Forest Health Protection Program staff would like to thank in particular the many photographers that contribute to the image archives at http://www.forestryimages.org. Many of their images are used throughout these webpages.

Sources for the introduction on the front page of the Gallery

Howard, L. O. 1898. Danger of importing insect pests. 1898. In: Yearbook of the United States Department of Agriculture. 1897. G. M. Hill, Editor. Government Printing Office, Washington. Pp. 529 552.

Liebhold, A. M., W. L. MacDonald, D. Bergdahl, and V. C. Mastro. 1995. Invasion by exotic forest pests: a threat to forest ecosystems. Forest Sci., Monograph 30. 49 pp.

Mattson, W. J., P. Niemela, I. Millers, and Y. Ingauazo. 1994. Immigrant phytophagous insects on woody plants in the United States and Canada: an annotated list. USDA For. Ser. Gen. Tech. Rep. NC-169, 27 pp.