Others have presumably already said this, or you were taking the mickey or something, but...
According to the article, "Rasberry" is the way in which you spell the surname of the chap after whom the ants are actually named. As opposed to the fruit.
I can't be bothered to check whether his name really is Rasberry or Raspberry. Or something else altogether.
Flames 'cos these critters are presumably still preferable to fire ants. Or a fire.