Which statement about Musca autumnalis is NOT true?

Musca autumnalis, commonly known as the face fly, plays a significant role in livestock health, particularly concerning its interactions with cattle. The statement indicating that the eggs are laid on the cow's face along the eyelid margin is not true. In reality, face flies lay their eggs in fresh manure, where the larvae develop in a more suitable environment.

The other statements regarding Musca autumnalis are accurate. The flies serve as a vector for Moraxella bovis, the bacterium responsible for infectious bovine keratoconjunctivitis, commonly known as pinkeye. Additionally, they are indeed known to cause pinkeye in cattle, leading to significant discomfort and health issues in affected animals. The feeding habits of Musca autumnalis involve not only nectar but also decaying organic matter, as they require moisture and nutrients found in such environments.

By understanding the life cycle and habits of Musca autumnalis, one can better appreciate its role in cattle health and management.