Bugs and Plants

I was watering the plants the other night and noticed that the bugs have really attaked a few of our plants on one side of the house in particular. I'm not sure what the bugs are, or why they chose that side of the house, but I don't know how to prevent it. I sprayed some bug stuff around the foundation twice this summer, and it seemed to keep the bugs away...all except that side of our home. Next summer I'll have to try something different.