right rail, mushroom phorid flies

right rail, mushroom phorid flies

different stages of flies

Three life stages of the mushroom phorid fly are shown: from bottom, pupa, larva and adult. This species is an "obligate fungal feeder," meaning it cannot feed or survive on anything other than the thread-like fungal mycelium found in mushroom compost. The flies are not known to be a health hazard to humans or carry any human or animal disease-causing organisms, but the sheer numbers of them and their ability to infiltrate homes are severely stressing out some southern Chester County residents.  

IMAGE: Stefanos Andreadis
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