SAN DIEGO - A motorcycle crash at a rural road crossing in the East County highlands sparked a fast-moving wildfire that blackened about 15 open acres Friday afternoon and prompted some evacuations but caused no structural damage.

The traffic accident occurred at Wynola and Farmer roads in northern Julian shortly before 1:30 p.m., according to Cal Fire.

As medics took the injured motorcyclist to a hospital, flames sparked by the crash spread rapidly up a brushy roadside slope, said Mike Mohler, a fire captain with the state agency.

Ground crews fought the blaze with help from personnel aboard two air tankers and three helicopters. Deputies, meanwhile, advised residents of about two dozen homes in the area to evacuate as a precaution.

Firefighters had the spread of the flames, which came within a few hundred feet of several residences, halted by 2:45 p.m., Mohler said.

The blaze caused no reported injuries.