Do ALL Ectoplasm Effects Hit Incorporeal Creatures?

[Tsunamiatunzen1]

The system is D&D 3.5/Pathfinder.

One of my players just recently manifested an Astral Construct in order to go after an incorporeal creature (a Banshee to be exact). The player cited the fact that Astral Constructs are solidified ectoplasm (supposedly the same stuff ghosts are made out of) and should be able to hit them.
Though I am slightly inclined to let the construct be capable of attacking incorporeal creatures, I'm having a tough time finding anything within the rules that supports this.
On a similar note, I'd like to know if things like Ectoplasmic Cocoon, Dismiss Ectoplasm, Ectoplasmic Sheen, etc. would affect Incorporeal creatures. If they do, things could get... interesting.

[InvisibleBison]

As far as I can tell, ectoplasm and ghosts have nothing to do with each other in D&D, despite the fact that the two are closely associated in non-D&D areas.

Ghosts (http://www.d20srd.org/srd/monsters/ghost.htm) live on the Ethereal Plane. Ectoplasm is "a portion of the astral medium drawn into the Material Plane (http://www.d20srd.org/srd/psionic/monsters/astralConstruct.htm)".

[Dalmosh]

That would depend on whether you include the rules on ectoplasm from the ghostwalk campaign setting or not. If you do then the logical assumption is that ectoplasm is ectoplasm and that “ghost” effects intersect with psychic effects in the manner you describe. From a crunch perspective I allow that.
Fluff-wise it is inconsistent at the outset as these two “ectoplasms” are derived from different planes. I still allow it because it is cool.

[Zombimode]

By default, neither Ghosts in particular nor incorporeal creatures have anything to do with "ectoplasma".
The term seems to be a in-world descriptor with no coresponding mechanical extension.

[Dalmosh]

http://www.thepiazza.org.uk/bb/viewtopic.php?f=102&t=17023

Here's a thread getting into more detail on this by drawing on a third rules set from Planescape.
Basically these two kinds of ectoplasm should probably have different names and be treated differently, but its pretty much your call as DM as to how your world's cosmology works, which rules you are using and how much weight you put on accompanying fluff text.