PEABODY – State Police said a multi-agency team surveying the region by helicopter this week has found three marijuana patches in Essex County, including 10 plants in Peabody.State Police spokesman David Procopio said in an email Thursday that the statewide drug unit, local police and members of the National Guard conducted marijuana eradication flights over the North Shore on Wednesday and Thursday. The flights are done regularly during the growing season, county by county, Procopio said.Trained spotters used a National Guard helicopter to find the marijuana plants and then relayed locations to ground units, which consisted of state troopers, local police officers and National Guardsmen.Plants on public property will be cut down; if on private property, police will speak to the property owner and then cut the plants, police said.”If it is a large grow, we will take the plants for evidence and, if warranted, take out complaints against the grower,” Procopio said. “Usually the grows we locate are planted for personal use.”Police reported locating and seizing about 70 plants in Rowley on Wednesday. Police also did a consent search at the house, Procopio said. Police on Thursday found two smaller patches: four plants at a Salem location and 10 plants at a Peabody site, Procopio reported. Plants from both sites were cut and will be destroyed by the State Police Narcotics Inspection Unit.