Me too!

I have used those 12" long  1/8" diameter bamboo skewers .

When used in the [dry] open just for support - no problems.
When used inside any confined damp/moist space (e.g., a vented dome) - dark grey mold develops within a few days!

I guess that they come already infected with mold-spores (mostly from China).
Funny, their purpose is to help cook food for us humans - but fire does kill everything...

Probably soaking them (skewers) in full strength-bleach should clean them up for all gardening purposes.

Bamboos in general are a very useful/strong form of (another) wood form.

Bamboo stakes with that outer tough 'skin' are almost indestructible.

yeah.. used it once, and only once. nasty stuff grow on those bamboo sticks. tried cup, and bag also.. not worth the effort. home made humidity dome using two large plastic box works the best. just make sure to clean them after each batch.

I grow a lot of bamboo so use a lot of stakes from it.  The mold happens because bamboo is a grass and so has a lot of natural carbohydrates for the fungus to feed on.  Even if you clean it with bleach the fungus will still happen as the fungus spores are all around us.  Just is not a good material to use inside an enclosed humid environment.  

It is rather curious that every nursery out there, uses them to support plants (Grapes, kiwi and other climbing plants) as well as other plants and fruit trees.  

Guys, just spray the wood with Physan 20/water mixture.  Your mold problem will completely disappear.  You guys need to really check this stuff out.

Grasa,

The stakes are fine for the uses you mentioned.  It is when you put the bamboo inside a very humid environment like inside a plastic bag or plastic dome that you will have issues.