DES MOINES, Iowa (AP) — Residents of two eastern Iowa counties may notice low-flying airplanes next week as officials work to slow the spread of the gypsy moth.

The Iowa Department of Agriculture announced Tuesday that planes would fly June 27 or 28 over wooded areas in Allamakee and Jackson counties to release pheromone flakes.

The flakes, which disrupt the ability of male gypsy moths to find female gypsy moths and reproduce, will be dropped over a total of 13,520 acres at three sites.

The planes will work beginning about 7 a.m.

Gypsy moth larvae feed on over 300 species of trees and shrubs. Officials say next week’s treatment should delay the establishment of the moth in Allamakee and Jackson counties.