Two Emerald Ash Borer (EAB) larvae collected by a homeowner from a residential tree in Story City and have been positively identified as EAB by a federal identifier. Story County is the 13th confirmed infestation in the state.
A statewide quarantine restricting the movement of hardwood firewood, ash logs, wood chips and ash tree nursery stock out of Iowa into non-quarantined areas of other states was issued on Feb. 4 and remains in place.
"We continue to monitor EAB closely and the Story City infestation is the ninth confirmed infestation in Iowa during 2014. The Iowa EAB Team again reminds Iowans to not move firewood as that is the quickest way to start an infestation in a new location," said State Entomologist Robin Pruisner of the Iowa Department of Agriculture and Land Stewardship.
The city of Story City has inventoried the street trees in the community, and working with the Story City Tree Board, will continue to monitor, assess and address ash trees. Story City will have information available for private property owners at www.cityofstorycity.org after Sept. 1.
The Iowa EAB Team provides EAB diagnostic assistance to landowners and includes officials from Iowa Department of Agriculture and Land Stewardship (IDALS), Iowa State University Extension and Outreach, the Iowa Department of Natural Resources (DNR), USDA Animal Plant Health Inspection Service and the USDA Forest Service.
The Iowa EAB Team strongly cautions Iowans not to transport firewood across county or state lines, since the movement of firewood throughout Iowa or to other states increases the risk of spreading EAB infestations. Most EAB infestations in the United States have been started by people unknowingly transporting infested firewood, nursery plants or sawmill logs. Besides being transported by vehicle, the adult beetle can also fly short distances of approximately two to five miles.
With the exception of trunk injection, the window has closed for using other preventive methods against emerald ash borer this year. Trunk injections can be done by certified pesticide applicators until Sept. 1. Other control measures (soil injection, soil drench, and basal trunk sprays) will need to wait until mid-April to mid-May 2015. This gives people the opportunity to have landscape and tree service companies to bid on work, and for the landowner to review these bids before next spring.
Please contact Iowa EAB Team members to have suspicious looking trees checked in counties not currently known to be infested. The State of Iowa will continue to track the movement of EAB on a county-by-county basis. Before a county can be officially recognized as infested, proof of a reproducing population is needed and an EAB must be collected and verified by USDA entomologists.
To learn more about EAB and other pests that are threatening Iowa’s tree population, please visit www.IowaTreePests.com.