What is the most effective method for controlling box elder bugs?

The most effective method for controlling box elder bugs is removing box elder trees. This approach directly addresses the source of the problem, as box elder bugs primarily feed on the seeds and foliage of these trees. By eliminating their food source and breeding habitat, you can significantly reduce their population in the area.

While insecticides can provide a temporary solution by killing active bugs, they may not prevent new infestations and often require repeated applications, especially if the trees remain nearby. Traps can capture a number of these insects but do not solve the root issue, as they don't remove the source of attraction. Sealing cracks in buildings can help prevent them from entering structures but does not control their outdoor presence and population. Thus, removing box elder trees is the most comprehensive method for long-term control of box elder bugs.