no, ladybugs are VERY beneficial and can cause only good...but make sure they are ladybugs. there is a beetle that runs around looking like ladybugs but have a different spot combo and they suck plant juices from the soft trunks of green plants. i'm sure a google would answer your bug question. but problem is, if you have no aphids the ladybugs will die of hunger so it might be best to put them outside...or get yourself some aphids...lol