The purpose of some insects

I grew up in Malaysia and in the tropics we are used to all manner of exotic insects, some of them being not so pleasant. I am familiar with the ladybug you mentioned. In Asia there are certain types of birds similar to European flycatchers that eat them. I would imagine that in a new environment like in Louisiana, there would not be any natural predators so it would be inevitable that their numbers would expand greatly. I am sure these insects were either introduced by accident or else blown there by some freak storm or hurricane.

I really do not know the solution to this problem. Like the snakehead fish (which is also found in Malaysia), if this problem is not contained, these ladybugs will no doubt spread and wreak havoc on North America's ecosystems.