...que se deshacían en polvo, Las incidencias de la jornada

...que se deshacían en polvo, Las incidencias de la jornada
 

1. that destroyed () dust, I don't know what "en polvo" could possibly mean with "deshacerse".

2. The incidents of working days. Sounds kind of weird to me.

I think that "deshacerse en polvo" = "to fall apart into dust, to become dust".

Las incidencias de la jornada...

the routine of ...

Jornada can be translated as travel or days work (working day), so more context is needed. :)