Problems with transparency rendering hair particle objects

I am a noob. So i don’t know if i missing something.

I have a plane with a hair particle system. I select and object instead of strands. This object has a texture, with transparency.

When i render y give artifact around particles. Is a blender problem or i am missing something?

Tested in Blender 2.70a and 2.69.0 so i think i am the problem.


What i am missing. I can send you the blend file (is 62Mg).

Thanks by the way.

Show us your material settings

Have you enabled transparency ?
Have you set the object texture to influence the alpha ?

This is what you want to see? I have tryed with nodes till i have seen that the result is corret on preview window, in viewport this artifacts do not appears when i change to rendered mode.
Material:



Material panel:


Viweport render:

Thanks by the way for your help Richard.