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Red Worms in Horse Trough are Red Midge Fly Larvae

“I found these in my horse trough”, writes Karen about the red worm-like critters pictured below. “They seem to have ‘casings’ of some sort that seem to be ‘absorbed’ by the plastic/rubber trough itself. There are strange “scratch lines” on the side of the trough, and these lines I have noticed elsewhere in my barn. Is it a pinworm? Can pinworms be transmitted through different types of materials? Please, tell me everything. I am in Stafford, Virginia, and these worms were in water. It is October, and the weather has been pleasant. There was recently a huge amount of rain with Hurricane Ian. Can these worms get into wood? Is this the larval stage of something else? Thank you!”