It is the Aussies who started sledging & bad behaviour on the field. But dey always hv got away with it. Red cards shud b issued in int'l cricket too. And it shud be the Aussies who shud get it 1st. Once Aussies start behaving themselves then all bad behaviour on field shall stop on its own.
1) Sledgeing by Bowlers, Captains, Slip fielders and wicket keepers.
2) Blocking a Batsman while he is Running on the wicket.
3) Excessive Appealing for getting more wickets.
4) Aggressive Gestures, Physical Intimidation and using Bad words in Native language.
All of these must be Rewarded with Red cards, Banning from 2 or 3 matches and heavily fined with money for bringing Disrepute to Country as well as Cricket in general.