The control area is set within the 24 x 24 km as shown in the picture below. Then a 0.5-km grid is set over the treatment block and control area. Cells that intersect with the treatment block are considered 'treatment cells'. Buffer cells are not used in the analysis. Then these interpolated values are averaged separately among treatment cells and control cells.
Treatment is assumed to be in year t .
If moth counts in the control area are too low, then equations above are very sensitive to the change of moth capture in a single trap. If this equation is used, then the value of T is marked with an asterisk in the table. The final goal of managing isolated colonies in the STS project is to deduce population numbers to the background level in the neighboring areas. In the areas far beyond the population front, the background moth counts in pheromone traps are close to zero. Thus, the colonies that are found in these areas should be edaricated, i.e., moth captures should be reduced to the zero level.