I don't remember the In Search Of episode, but I spent the late 70s being terrified of the killer bee invasion. I still remember those maps showing their migration, from Mexico, then covering Texas, and continuing their trek northward. Of course, it's possible these fears were fueled by my older brothers, who delighted in their ability to terrify me. They also managed to convince me that the apes from Planet of the Apes were going to invade (Boston??) sooner rather than later.