Ivermectin
Guides
Sepsis neocynipsea
black scavenger fly
Sepsis neocynipsea is a black scavenger fly in the family Sepsidae, widespread across the Holarctic region including North American grasslands. The species is obligate on cow dung for reproduction, with females depositing eggs on fresh dung and larvae completing development within or near the dung pat. Research has documented severe sensitivity to ivermectin residues in livestock dung, with females showing approximately three times higher mortality than males when exposed. The species exhibits complex interactions between chemical stress and environmental conditions, including potential hormetic effects where combined heat and ivermectin exposure can improve survival relative to ivermectin alone.