Ambrosia maple (Acer spp.)

Common Name(s): Ambrosia maple, wormy maple

Botanical Designation: Not a distinct species of maple; describes a fungal discoloration caused by wood-boring ambrosia beetles. The majority of ambrosia maple is found in species of soft maple.

Distribution: Primarily temperate regions in the Northern Hemisphere

Average Dried Weight: 30.2 to 38.0 lbs/ft3 (485 to 610 kg/m3) depending on species

Janka Hardness: 700 to 950 lbf (4,230 N) depending on species

Comments: So named for ambrosia fungi, which is found in association with ambrosia beetles. The beetles bore into the trunk of the tree, bringing with them the ambrosia fungi, which subsequently stains and discolors the surrounding wood. The discoloration can be very similar to spalted maple, though with ambrosia maple, the discoloration is centered around the boring paths of the beetles, and their entrance holes can usually be seen. (This also can create a challenge when finishing the wood as these holes usually need to be filled before a final finish is applied.)

Images: Drag the slider up/down to toggle between raw and finished wood. A special thanks to Mike Leigher for providing the wood sample of this wood species.

Ambrosia Maple
Ambrosia maple
Ambrosia Maple (turned)
Ambrosia maple (turned)

Identification: Since ambrosia maple is not a distinct species, the written information below is for red maple (Acer rubrum), though the endgrain images show a sample with ambrosia staining for reference. See the article on Hardwood Anatomy for definitions of endgrain features.

Ambrosia maple (endgrain 10x)
Ambrosia maple (endgrain 1x)

Porosity: diffuse porous

Arrangement: solitary and radial multiples

Vessels: small to medium; moderately numerous to numerous

Parenchyma: banded (marginal)

Rays: narrow to medium, normal spacing

Lookalikes/Substitutes: Red maple is more or less indistinguishable from other soft maples such as striped maple (Acer pensylvanicum), however, it can usually be separated from hard maple (A. saccharum)according to techniques in this article.

Notes: None.

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J ALEXISShaharNino G. CocchiarellaDoug CampbellDan kubasek Recent comment authors
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J ALEXIS
J ALEXIS

Thanks for all the great info. I am considering using this for a butcher block counter (which I WILL use as a cutting board). I am concerned about using this in a butcherblock / cutting board re what the glue & filler were for the holes… food grade?

Shahar
Shahar

I recently found a piece of hardwood with the ambrosia pattern, but it is definitely not maple, ignoring the pattern and looking at the endgrain id say it looks like african walnut.
Could ambrosia beetles infect all dead tree species?
I havnt found any records of ambrosia wood other than maple online

Nino G. Cocchiarella

Hello, We had a Maple tree right next to the house that had been dead awhile. We finally got it down and I had a feeling it was unique from the texture on the outer sapwood where the bark had fallen off. I did indeed have some curl and was very infested with the Ambrosia Beetle discoloration.

It’s all cut and drying now. I can’t wait to get it into the woodshop!

https://photos.app.goo.gl/98y2cuC2V15sKUaC9

Doug Campbell
Doug Campbell

I fill the holes with medium CA before I do my final cut. Then sand and finish. It gives the holes the perception that you can stick your finger in them but they are sealed and smooth.

Dan kubasek
Dan kubasek

The ambrosia maple sample that I see appears to be beech, as far as I can tell from the picture, and I’ve seen a lot of maple and a lot of beech in the last 41 years

Bill Robison
Bill Robison

I build mountain dulcimers and ambrosia soft maple is one of my favorite top woods. Most buyers do not want the worm hole covered, I just finish over them with amber shellac and it actually makes them more visible
Bill Robison

NOLIKEO
NOLIKEO

Look up S G Art Turning. He is in Canada and has some beautiful pieces, including a couple of sinks. He is very fortunate to have a friend that has land and gives him beautiful wood to turn. Love watching you turners!!

Thomas Knobel
Thomas Knobel

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I use Ambrosia Maple for cutting boards, boxes and turnings. I love this material. Attached end grain cutting board and Time Capsule box for church in Indiana

Chris Goodman Jr.
Chris Goodman Jr.

Goodman Drum Company Ambrosia Maple solid wood stave snare drum. This wood is one of our favorites!

Omry Yadan
Omry Yadan

Another turned Ambrosia maple piece.

Stevart
Stevart

I just got a plank of ambrosia maple with some curly to it. It is really pretty that I will use for a guitar top but it has worm holes. How did you fill in your worm holes? I figure you just need to just keep filling it with lacquer until they fill.

Leah Van Bergeyk
Leah Van Bergeyk

You can use epoxy as well which would probably take less time.

Jason Adams
Jason Adams

Like the other poster epoxy works but another approach is to rub some saw dust into the holes and put a drop of thin CA (super) glue on it when it is set up sand it lightly and drop a thicker CA glue on it. I have seen luthiers fill knots by putting CA on the knot and rubbing it with sandpaper while wet too but watch out for gluing your finger to the sandpaper. With epoxy you can make a paste from saw dust from the same wood and epoxy then spatula it in then sand and reseal. From… Read more »

Don Christopher Vinyard
Don Christopher Vinyard

best way is likely to use a visually appropriate inlay over the hole…

Jason Adams
Jason Adams

There are quite a few holes to be inlaying them all. What most Luthiers do is just sand up some dust and put a drop of CA glue on it. Then sand and finish. The dust is of the original wood and matches quite nicely normally but with ambrosia maple the fungal discoloring (spalting) keeps the hole location visible. What I do is fill with a natural filler and dab a marker on it then smear with alcohol till it looks natural only without the hole.

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