SA Police are asking for anyway who witnessed a fatal crash at Wattle Flat yesterday afternoon to contact them.

Police and emergency services were called to Main South Road, Wattle Flat, between Myponga and Yankalilla, just before 2.30pm on Saturday 24 September.

A truck and motorcycle had collided.

Despite the efforts of bystanders and paramedics, the motorcyclist, a 21-year-old Morphett Vale man, died at the scene.

The 37-year-old male truck driver was not physically injured in the crash.

Major Crash investigators attended and examined the crash site.  

Anyone who witnessed the collision or has dashcam footage is asked to contact Crime Stoppers on 1800 333 000 or online at www.crimestopperssa.com.au

The young man's death is the 55th life lost on South Australian roads so far this year, and the 9th motorcycle fatality.  

The road toll at the same time last year was 71.