What is this blackish brown stuff on my Colocasia?

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SavvyDaze Lady's Island, SC(Zone 8b) Jul 30, 2013

A new leaf grew on my Colocasia Esculenta about 4 days ago. It looked healthy until today when I looked at the underside of the leaf. I noticed a blackish brown substance (doesn't wipe off) on the leaf vein. And on the leaf between these veins are 1/4 to 1/2 inch thin lines of the same blackish brown color. (Reminds me the color of car oil). (Pics 1 and 2) I noticed the same thing happening to a relatively new leaf next to that one. Except it is on the stem. (Pic 3 and 4 - a little blurry, but you can see it.)

Does anyone know what caused this? Insect? Disease? Fungus? No chemicals have been sprayed, so that isn't an issue. I am clueless. Hope someone here can help.

Thanks!

Thumbnail by SavvyDaze Thumbnail by SavvyDaze Thumbnail by SavvyDaze Thumbnail by SavvyDaze
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SavvyDaze Lady's Island, SC(Zone 8b) Aug 04, 2013

Certainly I am not the only one who ever had this happen to Colocasia? LOL Did someone have ANY plants or flowers where something similar happened?

Any input, even guesses, might be helpful :)

Thanks!

Post #9620872
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Diana_K Contra Costa County, CA(Zone 9b) Aug 04, 2013

Well, you are not the only one. I have seen that sort of thing on many species. Never worried about it. Seemed to be a surface thing like maybe the leaf rubbed against something.

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drobarr Hummelstown, PA(Zone 6b) Aug 04, 2013

I agree with Diana_k. Its something physical...either from wind or something rubbed up against it...even leaves against leaves or branches. I cant think of any diseases or pests or anything physiological.

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