well it works great but just more come. im guessing our boxelder tree is FILLED with them and so once some space is available on the nice and toasty wall, more just come and take the place of their deceased relatives. we can spray the tree but it isnt as easy as the wall. the only area on the tree with massive groups is on the trunk so we can spray that but imagine how many could still be spread out in the leaves. we can try and spray the leaves but.... wouldnt be too effective i would imagine
these bugs are rather tough. they have no natural predators. NOTHING eats them
. if you crush one or disturb one it releases a awful scent that attracts more. i doubt my dad would be willing to use any residual pesticides because he would say " the only reason they come in the house is because of you." or something stupid like that. but he doesnt have to deal with them since he is rarely home.