Are the canes still green?

Yes

At least you know it's not borers...They are horrible. Did you cap the cut off canes with something like 'Elmers glue' to prevent wasps from laying eggs in those canes? Were the canes cut back bigger than 1/8 inch round?

Did the leaves fall off yellow? Do you have bugs eating the leaves? Were they green hen they fell off? Dehydrated or soft when they fell off?

My Tammy Clemons does the same thing. I don't know what it is. Can't treat unless you know what is the cause. Does anyone know if slugs does this?

No bugs, leaves dried up then fell off, thought they were dying.no holes in cut off canes. They are beginning to leaf out again. 3 hybrid teas, the rest are mini's.

Where they sprayed with anything such as neem oil . Is it possible to post a photo of damage either this time or if it should happen again. There are only a few thing that can cause this type of damage. Now to figure out which happened to your roses.

1 - they ran out of water. Were these new last year. Mini's can take forever to put roots down sometimes and it very easy for them to run dry.

2 - A spray was used that burned the leaves.

3 - Root problems as in perhaps they have been kept wet. If it is the roots it will likely happen again.

Even borers won't cause your plant to totally defoliate. I have so many types of borers here it drives me crazy. But I'll spare you that rant. Pics are the best way to get help. If you don't know how to post them on here ask and someone will help you. If no camera no problem we well still do the best we can.

A possibility?:

https://www.google.com/?gws_rd=ssl#newwindow=1&q=over+fertilizing+roses&spf=1498245646757