As noted in the section "Choice of Species," a number of insects and diseases may attack the species grown for Christmas trees. These pests are usually fairly specific in their symptoms and identification. Additionally, control measures using various insecticides and fungicides are very specific and are subject to the same labeling and use restrictions discussed for herbicides. Therefore, detailed information on identification and control of insects and diseases will not be covered in this manual. Information that is updated periodically can be obtained through the Ohio Cooperative Extension Service from local county agricultural extension agents.