IJGA Parent/Junior #2 at Deerpath

Appendix 1: In Stroke play, between the play of two holes, a player shall not play any practice strokes on or near the putting green of the hole last played. If a practice stroke is played on or near the putting green of the hole last played the player shall incur a penalty of two strokes at the next hole, except that in the case of the last hole of the round, he incurs the penalty at that hole.

As found in the current USGA Rules of golf.