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Blow fly?

 
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pwnell



Joined: 18 Dec 2009
Posts: 1945
Location: Tsawwassen, Canada

PostPosted: Tue Dec 19, 2017 9:50 pm    Post subject: Blow fly? Reply with quote

Is this a blow fly (Calliphora vomitoria)? It is winter here and for some reason I have a hundred of these flies in my house. Sometimes they cluster on windows, they fly sluggishly and keep on arriving even though I have captured and killed at least 60 of them. If I can identify what they are, perhaps I can understand where they come from. I do not have garbage older than 7 days in my house.










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Chris S.
Site Admin


Joined: 05 Apr 2009
Posts: 2884
Location: Ohio, USA

PostPosted: Tue Dec 19, 2017 9:58 pm    Post subject: Reply with quote

Unfortunately, my guess would be a dead mouse somewhere out of sight. (Don't ask why this comes to mind!)

--Chris S.
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razashaikh



Joined: 14 Nov 2017
Posts: 31
Location: India

PostPosted: Tue Dec 19, 2017 10:35 pm    Post subject: Reply with quote

Nice Work.
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pwnell



Joined: 18 Dec 2009
Posts: 1945
Location: Tsawwassen, Canada

PostPosted: Wed Dec 20, 2017 9:35 am    Post subject: Reply with quote

Chris S. wrote:
Unfortunately, my guess would be a dead mouse somewhere out of sight. (Don't ask why this comes to mind!)

--Chris S.


That is my feeling too Chris. However there is no small anywhere, so if this is the case, it must be somewhere in the roof or walls where I cannot access it, even by smell :S
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Olympusman



Joined: 15 Jan 2012
Posts: 3469

PostPosted: Wed Dec 20, 2017 12:02 pm    Post subject: Blowfly Reply with quote

Yep - I agree. Dead`critter in the house. The female fly laid only so many eggs. After those maggots have matured and you have spent a couple of days swatting, you will see no more flies. Had a similar experience last spring.
To save time on the swatting, go to an auto parts store and get some cold weather quick start spray which is very effective on flies and wasps, and if you don't ventilate effectively, you will get a nice buzz.

Mike
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Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA
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pwnell



Joined: 18 Dec 2009
Posts: 1945
Location: Tsawwassen, Canada

PostPosted: Wed Dec 20, 2017 12:12 pm    Post subject: Re: Blowfly Reply with quote

Olympusman wrote:
Yep - I agree. Dead`critter in the house. The female fly laid only so many eggs. After those maggots have matured and you have spent a couple of days swatting, you will see no more flies. Had a similar experience last spring.
To save time on the swatting, go to an auto parts store and get some cold weather quick start spray which is very effective on flies and wasps, and if you don't ventilate effectively, you will get a nice buzz.


I do not swat them - would leave a mess that I would have to clean up Smile So I catch them and count them. So far, in 1 week's time, I have collected two of these flasks with approx. 60-70 flies each:



I hope it is not a bear that died. I still find 20 flies per day...
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MarkSturtevant



Joined: 21 Nov 2015
Posts: 295

PostPosted: Sun Dec 31, 2017 10:44 pm    Post subject: Reply with quote

Looks like that species. I agree it is from 'something' that they can grow on.
I had the same experience here in Michigan toward the onset of winter once. They kept turning up in numbers, and then one day about 200 appeared. Must have been a synchronized emergence from wherever.
All I can say it that it passes.
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Mark Sturtevant
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ChrisR
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Joined: 14 Mar 2009
Posts: 7345
Location: Near London, UK

PostPosted: Mon Jan 01, 2018 4:35 am    Post subject: Reply with quote

I gave up trying to catch flies, thinking that they'd be an easy subject, to do a careful anatomical investigation. I couldn't encourage any, even with festering pet food or droppings.
A case of being careful what one wishes for...
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Chris R
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pwnell



Joined: 18 Dec 2009
Posts: 1945
Location: Tsawwassen, Canada

PostPosted: Mon Jan 01, 2018 10:20 am    Post subject: Reply with quote

Smile Well, they have all gone now so at least there is that. Not sure where they came from - could not find anything in the house. But then there is a lot of attic space and there is the central heating ventilation ducts too. Guess this will remain a mystery.
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Deanimator



Joined: 23 Oct 2012
Posts: 399
Location: Rocky River, Ohio, U.S.A.

PostPosted: Mon Jan 01, 2018 3:18 pm    Post subject: Reply with quote

I had a similar problem with tiny gnats earlier last year.

I thought I'd taken all organic garbage out, but I couldn't get rid of them.

Turns out I had a plastic sack of potatoes in a rolling bin that I'd forgotten about when my A1C started going up.

It was a nasty mess and within a couple of days of throwing it out and washing the bin, they were all gone.

Of course now I have no living things of which I can take macro photographs...
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pwnell



Joined: 18 Dec 2009
Posts: 1945
Location: Tsawwassen, Canada

PostPosted: Mon Jan 01, 2018 3:32 pm    Post subject: Reply with quote

Deanimator wrote:
Of course now I have no living things of which I can take macro photographs...


Spoken like a true macro photographer
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