A relatively new (2010) field guide is available from the US Forest Service called Invasive Plants in Southern Forests. Advisors of Forestry, ENR, and Wildlife Management CDE teams would be interested in this excellent resource.
ALSO. The Georgia Forestry Commission has three forest health regional specialists that can help you in the identification of insects and plants in our different CDE's. Here is a map and contact information:

Danny Bartlett
Forestry Area Teacher
South Region Agricultural Education
ABAC 34 - 2802 Moore Highway
Tifton, GA  31793
229/386-3198 (ofc)