Adults will do some feeding on plant leaves, but the biggest problem are the large number of migrating adults that move indoors. Land use changes such as development of the land in the area will affect populations. Barrier treatments are exterior insecticide applications that are designed to kill the insects before they gain access. To be successful they need to be in place before the invasion is in full swing. The base of all doors and window should be treated.
Sprays work well on surfaces.
Granular insecticides or sprays can be used for ground treatments. For some nuisance problems such as millipedes and imported longhorned weevils it is better to place the barrier at the edge of the property adjacent to the area the creatures are migrating from. Granular insecticides give a longer residual and can be placed in a 6-10 ft. wide swath. This strategy gives better results because it kills before the insects can get indoors. Many insecticides take two - four hours to work, and if the barriers are too close to the structure the insects can still crawl in and die and require a clean up.