The answer to 'how often for stink bug control' is that stink bugs are typically treated on an as-needed basis. Stink bugs can be a persistent problem, but the frequency of control measures depends on the severity of the infestation and the effectiveness of the treatments. In general, most homeowners will need to apply some form of stink bug control 1-2 times per year, either in the spring when they first emerge or in the fall when they try to enter homes to overwinter.
The best approach is to monitor for stink bugs and take action as soon as you start seeing them. This may involve using insecticide sprays, traps, or other control methods to eliminate them before the population grows too large. If the infestation is severe or keeps returning, it's best to consult with a professional pest control technician who can assess the situation and recommend the most effective and appropriate treatment schedule.