We also had a lot of bugs in our succah this year, more that usual. We live in EY and here we have “cartziot” – bugs that resemble lady bugs. The only way to get rid of them is to spray your shach with bug spray, but spray next year a few days before you put up your shach. If you spray it now, your run the risk of having the bugs decompose and rot in your shach, which can ruin it. I would also suggest spraying the walls as well. Good luck and don’t let the bugs bug you on Succos!