Abstract: A new fungal pathogen Entomophthora erupta infecting Cyrtorhinus lividipennis was found during a survey of pathogens of C. lividipennis in Guangdong province, China in 2009. The fungus caused an epizootic in rice fields during aut umn 2009, with infection rate in C. lividipennis reaching 33.1%. The main stages of C. lividipennis infected with the fungus were adults or 3^rd, 4^th and 5^th instar nymphs. Infection rates from the 3^rd, 4^th and 5^th instar nymphs and the adults of C. lividipennis populations were 2%, 6.7%, 8.3% and 14%, respectively. Sex ratio of C. lividipennis infected was 1∶1. Meanwhile, the disease symptoms were presented and the fungus was morphologically described from naturally infected host insects. This is the first report of a naturally occurring pathogenic fungus infecting C. lividipennis.