Tree care, from diseases to selection, will be the focus of an upcoming University of Georgia symposium set for Aug. 21 at the DeKalb County Extension office in Decatur.Registration for the Arborist/Landscaper Summer Training Symposium will begin at 8 a.m. and the daylong event will conclude at 3:30 p.m. Co-sponsored by the Georgia Arborist Association, the symposium will be held in the Extension office auditorium.Sessions will cover topics like present and projected shade tree insects, trunk injections of pesticides and fertilizers and shade tree diseases. Other sessions will cover how to select small trees for small spaces and how to fertilize large and valuable trees. Participants will also learn how to properly mix, handle and dispose of pesticides. Experts from UGA Extension, the UGA College of Agricultural and Environmental Sciences and private companies will lead the presentations. Four pesticide certification credits will be awarded for Categories 23, 24 or 27. Continuing Forester credits will be awarded in Categories 1 (4.5 credits) and 2 (1 credit). Participants can also earn 5.75 International Society of Arboriculture credits for attending the symposium.The cost of the daylong educational event is $65 for Georgia Arborist Association members and $95 for nonmembers. Registration includes a box lunch. Preregistration is required at www.georgiaarborist.org. For questions, call the DeKalb County Extension office at (404) 298-4080.