I used to have this game back in the floppy days. The story was somewhat like this:
Someone (you?) is trying to have a picnic, but mean ants are invading your picnic place. Luckily, you're equipped with ferocious anti-ant weapons (water, poison, etc.). I remember the queen making me sick.
Anyway, either I lost it or it was thrown away. I searched all over the place (internet, that is) with no result. I'm not even sure if it is abandonware. Maybe you guys could help?

This is kind of a long shot, but Picnic Paranoia?

I've just Pm'd Master MC to see if it's the right title.
Moved to unknown.