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 Post subject: Grub ID needed
PostPosted: December 31st, 2011, 5:56 pm 

Joined: February 28th, 2011, 9:09 pm
Posts: 173
Location: Baton Rouge, LA
This is the largest grub I have ever seen and if anyone has any idea what it is I would love to know. It was found in baton rouge, Louisiana.

Image
The purple spots are interesting, and something I have never noticed on a grub before.
Image

Thanks,
Jeff


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 Post subject: Re: Grub ID needed
PostPosted: December 31st, 2011, 7:05 pm 
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Joined: June 10th, 2010, 11:35 pm
Posts: 1802
Location: San Jose', Northern Catcrapistan
It's pretty big, so possibly Dynastes tityus. Strategus larvae can be pretty big as well, but I'm not sure how big LA species get.


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 Post subject: Re: Grub ID needed
PostPosted: January 17th, 2012, 8:17 am 
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Joined: June 7th, 2010, 8:23 am
Posts: 1665
Location: Unicoi, TN
It reminds me of the June beetle (Scarabaeoidea) grubs I find whenever I dig up and separate Hosta plants, here in the Appalachians (North and South.)
They make excellent bait for Smallmouth Bass and trout.


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 Post subject: Re: Grub ID needed
PostPosted: January 17th, 2012, 4:55 pm 
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Joined: June 7th, 2010, 3:56 pm
Posts: 1178
Location: New River (Brooker), Florida
Looks a lot like the Sugarcane Grub, Tomarus subtropicus, we have in Florida.

Daniel


Last edited by Daniel D Dye on January 17th, 2012, 5:21 pm, edited 1 time in total.

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 Post subject: Re: Grub ID needed
PostPosted: January 17th, 2012, 5:06 pm 
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Joined: June 10th, 2010, 11:35 pm
Posts: 1802
Location: San Jose', Northern Catcrapistan
Aren't Tomarus under an inch long? The grub looks to be 6-7cm, hence my Dynastes guess. Not that Strategus is out of the question either.


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 Post subject: Re: Grub ID needed
PostPosted: January 17th, 2012, 5:34 pm 
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Joined: June 7th, 2010, 3:56 pm
Posts: 1178
Location: New River (Brooker), Florida
T. subtropicus is around 2 inches long at third instar. Photos can be misleading when it comes to judging the size of the subject, however I believe you're right Owen, it's probably a Dynastes tityus.


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 Post subject: Re: Grub ID needed
PostPosted: January 17th, 2012, 6:12 pm 
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Joined: June 10th, 2010, 11:35 pm
Posts: 1802
Location: San Jose', Northern Catcrapistan
I actually meant adult Tomarus under an inch. I realize the grubs can probably get 4cm or so. I've seen enough Cyclocephala grubs to know that Dynastinae grubs are almost twice the length of adults when stretched out.

I'm wondering how big the Cotinis larvae get since I've seen adults into the 33-34mm range flying through my yard.


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 Post subject: Re: Grub ID needed
PostPosted: January 17th, 2012, 6:39 pm 
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Joined: June 7th, 2010, 3:56 pm
Posts: 1178
Location: New River (Brooker), Florida
Although Cotinis have been collected in the Gainesville area, I've never seen one. I've read the larvae is about 50mm long, the same size as T. subtropics.

You've peaked my interest...now I have to find an adult.


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 Post subject: Re: Grub ID needed
PostPosted: January 17th, 2012, 11:07 pm 
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Joined: June 10th, 2010, 11:35 pm
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Location: San Jose', Northern Catcrapistan
New grub challenge. I'm stumped by this one... about an inch long and was found under a log:

Image


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 Post subject: Re: Grub ID needed
PostPosted: January 18th, 2012, 6:54 pm 
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Joined: June 7th, 2010, 3:56 pm
Posts: 1178
Location: New River (Brooker), Florida
I'm with you on this one, Owen. I don't know.

It looks like a scarab grub and then again it doesn't. It's about to pupate I believe.

Did you take a photo of the raster?


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 Post subject: Re: Grub ID needed
PostPosted: January 18th, 2012, 7:28 pm 
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Joined: June 10th, 2010, 11:35 pm
Posts: 1802
Location: San Jose', Northern Catcrapistan
Daniel D Dye wrote:
I'm with you on this one, Owen. I don't know.

It looks like a scarab grub and then again it doesn't. It's about to pupate I believe.

Did you take a photo of the raster?


No other pictures.

Our scarab 'types' are all big or small. Big ones are Cotinis, Polyphylla, Pleocoma (1" +). The small ones (less than 3/8") are Dichelonyx, Serica, Aphodius. Cremastochielus, Sinodendron, Platycerus, Platyceroides, Cyclocephala are the only mid/small sized 10-15mm ones.

I just don't think it's a scarab, though it's built like one.


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 Post subject: Re: Grub ID needed
PostPosted: May 3rd, 2012, 8:26 pm 
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Joined: June 10th, 2010, 11:35 pm
Posts: 1802
Location: San Jose', Northern Catcrapistan
Owen wrote:
New grub challenge. I'm stumped by this one... about an inch long and was found under a log:

Image


I think that I figured this one out: Dascillus davidsoni

Here's an adult from my backyard today:

Image


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 Post subject: Re: Grub ID needed
PostPosted: May 4th, 2012, 6:20 pm 

Joined: May 3rd, 2012, 1:49 am
Posts: 15
First grub is some sort of scarab. Probably a Strategus species or Dynastes tityus. The second one looks like something sort of predatory, wish I could help more.


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