Delray Marketplace management has asked for state and county assistance. It has increased the frequency of its fly-prevention program and wants to conduct the most aggressive control program permitted. The managers also are working with the state Department of Health to identify the source of the flies. Until that report is done, it won't be known how bad the issue is or specifically where they are coming from. “This is just terrible,” said Nicholas Muccia, general manager of Ocean One, which only recently replaced the shuttered Cabo Flats at the north end of the marketplace. He attributes the problem to area farmers using fertilizer.