What's That Bug? does not endorse extermination

Subject: I have never encountered this at work before
Location: Seattle, WA
September 19, 2014 7:27 pm
I work in Seattle, WA on commercial boilers. The location I took these photos (which are actually screenshots from much more informative HQ videos that I took) is on the ground near an outdoor steam boiler in September at the end of summer. It was 75°F that day and was the last day of an unusually long and hot summer. The water (and sludge) these things were living in was very warm, I did not measure the temperature of the water but because it was continually being fed by 212°F boiler water. Please let me know if you need more information, pictures or video. Oh and these things were about half an inch long.
Signature: Aaron in Seattle

Rat-Tailed Maggot

Rat-Tailed Maggot

Dear Aaron,
One of your images appears to depict a Rat-Tailed Maggot, the larva of a Drone Fly,
Eristalis tenax.  According to BugGuide:  “The larva of the Drone-Fly feeds on decaying organic material in stagnant water in small ponds, ditches and drains. Such water usually contains little or no oxygen and the larva breathes through the long thin tube that extends from its rear end to the surface of the water and that gives it its common name of ‘rat-tailed maggot’.”

Rat-Tailed Maggot

Rat-Tailed Maggot

What's That Bug? does not endorse extermination
Location: Seattle, Washington
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2 Responses to Rat-Tailed Maggot

  1. Jude says:

    Hi I have got a lot of cow manure for my garden, but notice there is a lot of this rattailed maggot in it. Is this safe to use in my garden, of will the bugs destroy my plants? Regards Jude

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