DB disk IO problems - deathstar query

Hi Forum,

Why is this query at the top of the leaderboard over most resource consuming tasks in my DB-server?

SELECT trapItems.trap_id, RTRIM(trap_name), enabled_flag, trapItems.sev_vb FROM trapItems,trapItemsEx WHERE trapItems.trap_id = trapItemsEx.trap_id AND trap_generic_id = @P0

It is since this thursday continuously generating 60-80MB/s in disk access, why o why is this happening?

Any ideas of how to kill this deathstar?

Best Regards,
Johannes