(City of Boulder)

Officials have now found evidence of emerald ash borer in three more areas of Boulder and warned that the pest could spread this summer, according to the Colorado Department of Agriculture.

The beetle was first identified in Boulder in September. A survey to determine the extent of the invasion began in November, and larvae were found in five areas, including on the University of Colorado's East Campus.

Monitoring efforts by city forestry employees near the locations where the ash borer was detected in the original survey turned up "clear evidence" of the borer in three additional areas.

The three new areas are in north and east Boulder and include parts of the Flatirons Golf Course and Valmont City Park, according to Kathleen Alexander, the city's forester.

Officials said the pests may have been in those areas for several years, and they warned more areas could show signs of the borer down the road.

"We do expect to find it in more areas of the city this summer," Alexander said. "We know where the emerald ash borer is now, but it doesn't mean the other grids in the city are negative. It certainly could be in the other grids and it hasn't been detected yet."

Alexander said the city is in the midst of a pest survey conducted every summer, and crews are making sure to keep note of any ash trees that present with symptoms of the beetle.

State, city and county officials are working to monitor and contain the borer in urban ash tree populations. No borers have been detected outside the city of Boulder, but officials said they are still testing for them.

"We are looking everywhere within the county and some areas outside the county," said Laura Pottorff, of the Colorado Department of Agriculture. "We are working with the communities and commercial arborists. So far, they remain undetected."

For more information, including the current quarantine in Boulder County and surrounding areas, go to eabcolorado.com.

To report possible emerald ash borers in your ash trees, contact the Colorado Department of Agriculture at 888-248-5535 or email CAPS.program@state.co.us.

Contact Camera Staff Writer Mitchell Byars at 303-473-1329 or byarsm@dailycamera.com.