Textures not applied to custom tree model?

I’ve created some custom trees for a new game and I’ve got the texture as I want it in Blender, but, when I move that model to Unity, it just appears grey in the Tree Selector. What am I missing to bring that texture over with the model?

http://forum.unity3d.com/threads/134410-Basic-Blender-to-Unity-Meshes-not-Taking-Textures