Principles of Monitoring Gypsy moth populations are monitored using pheromone-baited traps. Traps are set before the start of the flight period and collected after flight termination. A higher trap density is needed in this area because the information about moth counts is used by the decision-algorithm model. All traps are milk-carton traps. In the areas that have a mile-based system of roads, we recommend to set trap grids diagonally, so that the intertrap distance would be 2.26 km.
All traps are delta-traps.
The base grid is not set in the areas where delimiting grids or treatment evaluation grids are located. Delimiting grids are set in the areas that apparently contain isolated colonies of the gypsy moth. The area for delimitation may be set a little larger or smaller than the area suggested by the decision algorithm in order to effectively detect the boundaries of the colony. Delimiting grids in the action zone are set with intertrap distance of 0.5 km. All traps are milk-carton traps because moth counts may be large in the center of a colony.