Got Bed Bugs? Bedbugger Forums » Detection / Identification of bed bugs

Test yourself: which photo shows bb fecal?

(30 posts)
  1. Richard_Naylor

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    Posted 7 years ago
    Mon Jan 24 2011 16:45:22
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    Look at the photo below.

    http://farm6.static.flickr.com/5215/5384962407_5db6a19d37_b.jpg

    The image shows two pieces of plain wallpaper, each 2 inches long. One was left in a pot with bedbugs, the other was left in a pot with another common household insect.

    Which is from the bedbug? What is the other insect?

    Any guesses?

  2. Bed Bug Epidemic

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    Posted 7 years ago
    Mon Jan 24 2011 16:48:12
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    My guess is B......

    -Lauren

  3. Bed Bug Epidemic

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    Posted 7 years ago
    Mon Jan 24 2011 16:53:07
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    I guess I have to wait for more responses to find out if I'm correct or not..... lol

  4. MyWorstFear

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    Posted 7 years ago
    Mon Jan 24 2011 16:59:40
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    They look almost identical to me (good thing I'm not a PCO), but "B" looks like it's got more bloody feces (I say this with the American definition of "bloody"), so I will say "B".

  5. Bed Bug Epidemic

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    Posted 7 years ago
    Mon Jan 24 2011 17:01:59
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    (I say this with the American definition of "bloody"), so I will say "B".

    lol

  6. EffeCi

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    Posted 7 years ago
    Mon Jan 24 2011 17:09:02
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    A = BBs
    B = American Cockroach

  7. spideyjg

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    Posted 7 years ago
    Mon Jan 24 2011 17:13:24
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    A is BBs.

    B????

    Scatology isn't my strong suit.

    Jim

  8. Claudia8Font8

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    Posted 7 years ago
    Mon Jan 24 2011 17:39:16
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    Letter B is the bedbug.

  9. Sleepless in NYC

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    Posted 7 years ago
    Mon Jan 24 2011 18:19:37
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    Wow so A is the bbs? I thought B because some of the feces looked thicker. Bb feces can look watered down and also have watered down ring around the edges too?

    None of the feces can be lifted up with tape can it?

    How wide a circumference can bb feces have?

    Looks like I failed the entomology course

  10. Bed Bug Epidemic

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    Posted 7 years ago
    Mon Jan 24 2011 18:35:36
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    no i don't think we got the answer yet from Richard_Naylor...

  11. Richard_Naylor

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    Posted 7 years ago
    Mon Jan 24 2011 19:31:31
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    It's good to see the pros are in agreement - or is it?!

    I'll let you know tomorrow.

    Rich

  12. Richard56

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    Posted 7 years ago
    Mon Jan 24 2011 19:48:52
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    Before seeing Effe and Jim's response I would have guessed "B" because of the little tails on some of the blood spots -- but then again I was positive that what turned out to be a beetle caught in my bathroom was a bed bug!

    Richard

  13. paulaw0919

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    Posted 7 years ago
    Mon Jan 24 2011 20:37:30
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    I agree with EffeCi.

    A Bed bug
    B Roach

  14. KillerQueen

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    Posted 7 years ago
    Mon Jan 24 2011 21:55:10
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    Where is option C ?

    A for sure is Bed Bug fecal ... B is either Oriental or American roach. My guess for B is American cockroach.

  15. Nobugsonme

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    Posted 7 years ago
    Tue Jan 25 2011 0:37:45
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    A= bed bugs.

    B= Cockroaches? (If so, is the reddish stuff food stains? Vomit? Messy eaters...)

    I started and run the site but am "not an expert."
  16. Richard_Naylor

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    Posted 7 years ago
    Tue Jan 25 2011 13:03:54
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    Hi folks,

    And the answer is...

    A - Bedbugs
    B - Blowflies (calliphora)

    It is good to see the experts weren't fooled.

    Well done!

  17. Grateful for Help

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    Posted 7 years ago
    Tue Jan 25 2011 13:20:03
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    That's cool to see, yay for the experts! (and by cool I mean 'gross' and 'wish I didn't know about these' of course!)
    I wondered, is there anything to the fact that the A sample was more grouped (congregated?) in one corner, I have read that BBs group together due to fecal traces...

    Just curious,
    -grateful for help

  18. Bed Bug Epidemic

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    Posted 7 years ago
    Tue Jan 25 2011 14:01:38
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    Well i'll be a monkey's bottom.

  19. EffeCi

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    Posted 7 years ago
    Tue Jan 25 2011 14:03:46
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    Richard_Naylor - 23 minutes ago  » 
    And the answer is...
    A - Bedbugs
    B - Blowflies (calliphora)

    No problem with the BBs one but, after I wrote my answer, I went in my "vault" to check my american cockroach colony... I controlled their faecal spots on the cardboard surface of their harbourages and then I thought "Rats! They aren't..." .

  20. Richard_Naylor

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    Posted 7 years ago
    Tue Jan 25 2011 14:13:25
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    Well spotted G.f.H.,

    The heaviest fecal spotting was where the bedbugs were aggregated in the pot.

    Sleepless : "How wide a circumference can bb feces have?"
    That's all down to hos absorbant the surface is and how aqueous the fecal spots are. The largest one in that photo is about 5 mm (or 3/8 inch) in diameter.

  21. Sleepless in NYC

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    Posted 7 years ago
    Tue Jan 25 2011 15:35:45
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    Thanks Richard. That was a great test. Fun too. Although, i have to say, now I'm freaked out.....

    Another question, the fecal stains on sheets cannot be lifted up with tape can they? they absorb into the fabric right?

  22. Richard_Naylor

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    Posted 7 years ago
    Tue Jan 25 2011 15:57:31
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    That's right. Unless the fabric is water resistant the fecal spot will be absorbed and won't be able to be picked up on tape.

  23. spideyjg

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    Posted 7 years ago
    Tue Jan 25 2011 16:16:23
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    Too many on B were streaky and many looked like dirty dishwater.

    A had one or two exceptions but all other were slight amber to black.

    Jim

  24. Sleepless in NYC

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    Posted 7 years ago
    Tue Jan 25 2011 18:14:32
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    Thanks again Richard. Your posts are most informative.

  25. victimized

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    Posted 7 years ago
    Tue Jan 25 2011 21:04:49
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    YAY I WAS RIGHT!!!!!!!!! I went by the consistency of stain size and pattern as opposed to colour. My guess was A. and no, I am NOT just saying that now that the answer was given

  26. peppy

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    Posted 7 years ago
    Tue Jan 25 2011 22:26:27
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    Richard, I noticed that in addition to the black stains there were a lot of light yellow stains. I had no idea BB fecal could look like that. If the black spots are digested blood, what are the yellow spots?

  27. soscared

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    Posted 7 years ago
    Tue Jan 25 2011 23:50:20
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    I've never heard of blowflies, but I was happy to know the answer - i knew A was bedbugs. Thanks to the generous postings of the experts on this site, I am more confident in my ability to identify bb fecal if ever I am to encounter it, god forbid.

  28. Richard_Naylor

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    Posted 7 years ago
    Wed Jan 26 2011 6:31:31
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    Thanks folks,

    Glad you enjoyed it!

    Peppy:
    "I noticed that in addition to the black stains there were a lot of light yellow stains."

    The light yellow marks are uric acid. All animals have to get rid of their nitrogenous waste (which comes from digesting protein). The easiest way it to get rid of it as ammonia, but this is very toxic so it has to be very diluted. No problem for aqatic animals such as fish, but no good for animals with limitted access to water. The next best way is to excrete it as urea (as we do). The process of converting it uses some energy, but the outcome is a product that is less toxic and can therefore be excreted in higher concentrations, so less water is wasted. Animals that really need to conserve water, go one step further and use more energy, excreting their nitrogenous waste as uric acid. This is not toxic and can be excreted almost dry. Aside from many insects, this is what birds and reptiles tend to do. Bedbugs have a very high protein diet, so it is not surprising that they produce a lot of it. Since they are often excreting it at the same time as excreting the digested blood, it often gets mixed, so you end up with a spectrum of colours from almost white (uric acid) to almost black (digested blood).

    So scared:
    "I've never heard of blowflies"

    You might have a different name for them, but I'm sure you will have come accross them as they are very common. These are the large, slow flying flies that often crash against your windows trying to get out. The family includes the greenbottles and bluebottles. The ones I used were hatched out from maggots I bought at a bait shop.

  29. peppy

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    Posted 7 years ago
    Wed Jan 26 2011 13:46:32
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    Richard, thanks for the explanation of the uric acid. I had never seen it mentioned when discussing looking for signs of bedbugs. Is that because if the bug is excreting uric acid we should also be seeing fecal traces? I have seen a few small yellowish marks on my bedding that kind of look like that, but actually assumed it was rust from the washer (if things sit for awhile in there, they can get rust stains). I'm wondering if I should be keeping a better eye on that now.

    The whole post was so informative, and made me realize that even if I do see a mark here or there, there could be a lot of other insect-related explanations for it. Thanks!

  30. Richard_Naylor

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    Posted 7 years ago
    Thu Jan 27 2011 9:31:48
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    Thanks Peppy,

    "Richard, thanks for the explanation of the uric acid. I had never seen it mentioned when discussing looking for signs of bedbugs."

    The black traces are produced very soon after (or even during) feeding. Consequently these are the ones that tend to be left behind on the bed sheets as the bug returns to its harbourage. The uric acid marks are produced as the bug digests its meal, usually back in the safety of the harbourage. Consequently, these marks tend not to be found on the sheets, but are usually around the crevice where the bug spends most of its time.


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