Currently viewing the category: "Sap Beetles"
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Subject: Bugs eating strawberries
Location: Zone 5 – New York
July 11, 2012 8:04 am
Can you tell me what kind of bug this is and how to keep it away from the strawberries?
Signature: -Roxy

Picnic Beetle

Hi Roxy,
This is a Fours Spotted Sap Beetle,
Glischrochilus quadrisignatus, and it goes by the other common names Picnic Beetle or Beer Beetle.  According to BugGuide it is:  “attracted by the odour of fermenting fruits and vegetables; the adult beetles fly into beer or soft drinks at summer picnics.”  The strawberry in the photo appears to be dirty as well as rotting.  We suspect something else might have done the initial damage.  Do you place straw on the ground around the strawberry plants?  That will help to discourage snails and slugs which love to eat strawberries.  If the strawberry in question was damaged by a slug and it then began to rot, that might have attracted the opportunistic Picnic Beetle.  If the Picnic Beetles are actually doing the initial damage, which we doubt, you can always leave a glass of beer in the area of the strawberry plants in the hope the beer will be more attractive to the Picnic Beetles than the strawberries.

What's That Bug? does not endorse extermination

Subject: I think this is a Silphidae
Location: Reese, MI
July 1, 2012 8:21 pm
I have an infestation of these bugs. By looking at the shell I think that these are from the Silphidae family. But all the information that I have found said that Silphidae do not bite but these do. They seem to come out at night and are attracted to apple cider vinager. Please help me identify these pests and come up with a way to keep them away from my deck!!!!
Thank you
Signature: Tireman2000

Four Spotted Sap Beetle

Dear Tireman2000,
Why ever do you keep a container of vinegar outside if it attracts these Four Spotted Sap Beetles which are also called Picnic Beetles or Beer Bugs.  We identified them first by doing a web search for vinegar beetles and we found a Sap Beetle on the Cape Beekeeping website.  The website author traps beetles in his bee hives by using mineral oil and cider vinegar, and he had a photo posted that was identified as a Sap Beetle that looked like your beetle.  Armed with that information, we found the Four Spotted Sap Beetle,
 Glischrochilus quadrisignatus, on BugGuide where it states they eat:  “various fermenting substances” and they are “attracted by the odour of fermenting fruits and vegetables; the adult beetles fly into beer or soft drinks at summer picnics.”  Again, please let us know what you are doing with the vinegar.

Vinegar attracts Sap Beetles

 

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Elm Tree Bug
Location:  Eastern Colorado
September 22, 2010 2:26 pm
Dear Bugman,
I am searching for an identification for the group of bettles in the enclosed photo. They have gathered in a sap pocket of an American Elm Tree in Eastern Colorado.
Signature:  Daniel

Sap Feeding Beetles

Dear Daniel,
It is difficult to make out the details of the individuals in your photo, but we nonetheless believe they are Sap Feeding Beetles in the family Nitidulidae, possibly
Glischrochilus quadrisignatus, the 4-Spotted Sap Beetle which is pictured on BugGuide.

Thank you very much for the information!  That looks to be the correct match!  What a great service you offer!  I would recommend whatsthatbug.com to anyone!
Very grateful,
Daniel

What's That Bug? does not endorse extermination