Environmental health officers are investigating an infestation of flies in an Oxfordshire village.
Officers have been visiting farms to check waste is disposed of properly
More than 30 homes in Crowmarsh Gifford, near Wallingford, have been plagued by the outbreak.
Staff at the village primary school have been forced to stop serving meals as the kitchens have been targetted by the swarms.
The district council said officers have visited farmers to ensure they were correctly disposing of animal waste.
A spokeswoman for South Oxfordshire District Council said: "We are appealing to local people to help us identify the source of the flies.
"There has been a problem in previous years, when flies were stirred up during harvesting, but not to the extent of this year, when it has become a major problem."
Crowmarsh Gifford Church of England School, where meals have been suspended, has 180 pupils aged four to 11.