Myrmecophobia is the inexplicable fear of ants. It is a type of specific phobia. It is common for those who suffer from myrmecophobia to also have a wider fear of insects in general. Such a condition is known as entomophobia. This fear can manifest itself in several ways, such as a fear of ants contaminating a person's food supply, or fear of a home invasion by large numbers of ants.
The term myrmecophobia comes from the Greek μύρμηξ, myrmex, meaning "ant" and φόβος, phóbos, "fear".
References
Myrmecophobia Wikipedia(Text) CC BY-SA