[5] Horse bottle flies lay their eggs typically around the submaxillary area on the hair of the equine.

Once the larva hatched, it crawls to the mouth and enters the oral cavity, where it spends up to 21 days in the tissue of the tongue.

In the second instar, the larva relocates, after approximately four weeks in the oral cavity, into the stomach, more specific, to the pylorus.

The most common symptoms are: extreme salivation, shaking of the head, problems with chewing and general irritation of the oral cavity.

[3] Since the Gasterophilus species occur very often, a general treatment with Ivermectin can be done in autumn, also in non freezing temperatures.