Bands of white powder forming on the body of various species of flies, including houseflies. This powder is composed of spores (called conidia) which are forcibly expelled from the fungus and may fall on other, uninfected flies. When a fly is infected, the spore germinates and grows into the fly's body, digesting its organs. The fungus invades the brain, forcing the fly to climb upwards and then spread its wings and front legsand raise its rear to facilitate dispersal of the spores. Once the fly is positioned and dies, the white fungal spores emerge The fungus cannot handle high temperatures and an infected fly may cure itself by seeking hot places to rest. .

Found anywhere there are flies, and so kills a certain proportion of Wildwood's flies. Another place to look for it is on the bodies of house flies that die on windows.

Easily identified by the white bands, and the fly's position, providing one can identify the insect as a fly.