In summer 2006, the destructive insect was found in several nearby towns, and Skokie is in the quarantine area established by the Illinois Department of Agriculture (IDOA). In April 2007, the IDOA confirmed the presence of the emerald ash borer in a tree at Crawford and Grant Avenues in northeast Skokie. Skokie has approximately 3,000 ash trees, representing 12% of the Village's 24,000 trees growing on public property. Each year, Village foresters perform a systematic survey of all parkway ash trees. Those determined to be in poor condition or with evidence of emerald ash borer infestation are marked with white paint for removal. Residents are notified if a tree on their parkway will be removed. The Village does not offer financial assistance for the removal of trees on private property. Residents concerned about an ash tree on their property are encouraged to call an International Society of Arboriculture-certified arborist who has signed the "Emerald Ash Borer Compliance Agreement" with the IDOA.