Question
Recently we have noticed an "orange" residue on our lawn.  It is particularly noticeable in the morning when the grass is damp and you walk through it, our shoes turn orange from just walking through it.  Any idea what this might be and what we need to do?

Answer
It sounds exactly like you're dealing with Rust.  This is a mild fungal disease, and the orange stuff you are seeing is the spores of the fungus.  Typically it does not merit treatment even if it is annoying.

Rust appears as an orange or yellowish-orange powder (spores) on grass leaf blades, especially in late summer to early fall when the weather is dry. It typically develops on lawns and other turf areas growing very slowly. Overall, the turf may assume a yellow, red, or brown appearance. Close examination will reveal the pustules, which easily rub off on your hand. Rust spores can easily be tracked into homes.

Rust is simply taking advantage of the grass as its growth is weakened in the heat of the Summer and with lower fertility and water.  As we head into the Fall, the grass becomes much stronger and more aggressive, and the rust subsides.  

I have never seen this become a serious issue on a home lawn, so you can feel comfortable that the range shoes are the biggest of your worries.