Throughout the year’s warm months, Holgate, on Long Beach Island’s southern end, is dotted here and there by boxy wooden structures on four legs: fly traps used to control the area’s least welcome seasonal visitors.

“When there is a west wind coming from the mainland in the summer, these traps fill quickly with greenhead flies,” said Holgate Taxpayers Association President Rand Pearsall. “There is no other effective solution to the greenheads.