What bug is this in my wood?

Not sure but might be a powder beetle grub
Check here- http://www.naturalhandyman.com/iip/infpests/infpowderpost.html

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

Hm. That piece is going in the waste bin now. It’s nothing special and I don’t want this to spread.

You can put it in a black bag tie it tight and leave it in the sun for a couple days

-- Coach Mancuso

Will that work? I thought only kiln drying would kill them.

I checked some other pieces that looked the same (Apparently I didn’t treat the ends of this batch) and found one more piece with bored exit holes and another piece with at least one grub. All next to each other.

Also checked a piece of Sweetgum lying nearby, with anchorseal on the ends. ...No, that one is just going moldy underneath the bark. FFS.

Looks like you have a piece of walnut there. Strip the bark off and just scrap the log off, You should get all the grubs off that way, they just work under the bark.
Power post beetles are tiny little things that like the sap wood mostly.

-- Richard http://www.PictureTrail.com/gallery/view?username=thewizz

Yea, I agree.. I don’t think that is a powder post beetle. The dust is like talc not at all what your pictures look like.. and like zwwizard said, they are tiny… that grub is way too big.
david

-- david

It is a beetle larvae, one of many species it looks real close to the longhorn beetle larvae and yes they tunnel through wood, Elizabeth if it can fit into a microwave that will also kill them anything with heat such as your oven for a short bit but not to long, the loose wood that the beetles cause can add character to the wood and you can harden it up by dripping super glue on it, the super glue finishes great it never leaves any sign.

-- Randy - If I'm not on LJ's then I'm making Saw Dust. Please feel free to visit my store location at http://www.facebook.com/randy.blackstock.custom.wood.designs

They look like roundhead borers otherwise known as longhorn beetle. I’m pretty sure once you strip the bark they will be gone. Because it was standing on end it allowed the wood to wick moisture up into it. Those beetles work on the moist sapwood just under the bark. Once the bark is gone it will be too dry for them.

-- Bondo Gaposis

hey guys down here in missouri we got like 6 countys that cant sale fire wood becouse of some Green bug that is eating ash and sawmills cant cut or sale any ash etherso you my what to look around its about a 1” long and green.

I don’t know but I think I see one coming out of my nose!

-- I came, I was conquered, I was born again. ἵνα ὦσιν ἓν

I thing I read somewhere that 140 degrees F would kill bugs in lumber.
Due to the mass of those logs it might take a few days to soak the heat through from sitting in the sun, but I suspect it would work.

The black plastic bag method, with bark stripping will do the trick. Im in California and I see this in wood piles all the time. Ive only seen them on wood with bark intact.

-- Made in America, with American made tools....Shopsmith

Nice to know Michael.

-- Randy - If I'm not on LJ's then I'm making Saw Dust. Please feel free to visit my store location at http://www.facebook.com/randy.blackstock.custom.wood.designs

You could put it on the dash of your car. 140 deg is easily obtainable when it is sitting out in the hot sun. I measured several places inside my truck once years ago when I was at work and had access to a high temp digital thermometer (used to measure tube temps in furnaces).

Actually, I am just kidding about putting it in your car but serious about the temps. The glass window adjacent to where my head normally would be when driving was 131 deg F. The console was about the same. The dash was 141. It was 98 outside.

-- Handcrafted by Mike Henderson - Channelview, Texas

Thanks guys. Feeling a bit better about all this now. I’ve pulled out the afflicted logs – since I hadn’t sealed the ends they all cracked heavily anyway, so I decided to ditch them. Not seeing any loose bark on any pieces that had had sealed ends, but I’ll keep an eye on them, and I have taken a bunch of air dried western red cedar boards (a couple of them showed similar trails) and black-bagged them in the driveway on Saturday. One of the bags appears to be melting so I guess they’re getting pretty hot!

I also found this little guy in my shop, chilling out behind a piece of plywood that my bandsaw came in a few months back. He doesn’t appear to be either a powder post or an asian longhorn beetle; not sure who he is. Forefinger for scale.

He was somewhere else in the shop entirely so I am hoping he’s not a troublemaker.

I’m spending as much time as possible over the next few days cutting up the remaining sweetgum. I got through two pieces yesterday. Fun side note; yes they were starting to get a bit moldy, but some pieces have also got some interesting spalting from it. So I guess there’s that. I haven’t been running my dehumidifier because it appears to have broken. I guess that is why they started to mold.