Rosin Bags in Baseball: Who Provides Them?

Question
My daughter keeps getting told she's not wiping her hands off enough when she puts her pitching hand in the dirt before pitching. Should the umpire supply a rosin bag?

Answer
Todd,

I haven't ever seen an umpire supply a rosin bag.  This would be something the team supplies.  The rules say that rosin can be used "under the supervision and control of the umpire".  I suppose if a team wanted to supply rosin, a pitcher could use it as long as it was supervised by the umpire.

I think that if a pitcher supplied me with a rosin bag in a game I was umpiring I would keep control of the rosin bag by putting it on the ground at the back of the circle.  I would supervise its use from my position behind home plate.