Clark Pest Control has grown to be the West's largest pest management company with branch offices throughout California and in the Reno, Nevada area.
BBC Spotlight's Matt Pengelly went to the ground to investigate.
Players at a Cornish rugby club have complained they are being plagued by insect bites.
St Columba and Torpoint Rugby Club said its players were being bitten by flies hidden in the pitch.
One needed hospital treatment for a bite and others have been given antibiotics.
It is believed a water-logged pitch may be offering the flies a good breeding area. The club said it was monitoring the condition of the ground.
Prop forward Mike Grieve said he was bitten three times on the legs and ankles.e was given antibiotics on two occasions, but a third encounter with the hungry insects resulted in him having to go to hospital.
He said: "It was just like a normal bite, and then the leg swelled up. After about a week the bruising was still there."
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