thats why you need a good clearing around your house, so they don't go there or face being eaten by birds (i believe they watch out for clearings, its like a tank being out in the middle of a desert with no camouflage, think Desert Storm 1). I recommend gravel and not grass. At least limit it where possible, then individual bushes pose less of a threat and can be sprayed, this way I believe also the perimeter defense spray that has a semi bad reputation works better. Keep bushes neat too (not brushing up inches from the windows, get yourself a long hedge saw, prevent them from touching the house by as much as possible while keeping the look decent (like 6 inches at least). I also think you can leave evergreens more alone, I think its leafy stuff that poses a bug hazard).