Vuvuzelas could be banned in South African football grounds unless Kaizer Chiefs fans improve their behaviour.At a recent cup game, supporters of the country's most popular club threw two vuvuzelas and a cabbage onto the pitch.Chiefs have been handed a suspended fine of US$72,130, while their chairman was ordered to make a public apology."Should vuvuzelas continue to be used as missiles they could be banned," the Premier Soccer League's prosecutor Zola Majavu said on Thursday.Many football fans watching this year's World Cup in South Africa on television wish that vuvuzelas had been banned, given the wasp-like drone that accompanied match commentaries.However, thousands of supporters took vuvuzelas to games, with many visiting fans purchasing an item that came to symbolise the 2010 World Cup.Should any Chiefs fan throw a missile onto the pitch for the rest of the season, the Johannesburg-based club must pay its fine - and could prompt a vuvuzela ban.Chiefs were also ordered to pay costs of US$3,000 for the disciplinary hearing and told to hold a news conference to denounce spectator misbehaviour."We call upon (fans) to help identify rogue elements intent on causing disruption," club chairman Kaizer Motaung told the news conference on Thursday."Once (they are) identified we intend to blacklist theses individuals."In recent years, South African fans have started taking loaves of bread and raw cabbages to games, eating them in front of television cameras to symbolise 'eating' their opponents.Chiefs fans, meanwhile, have taken credit for making the noisy plastic vuvuzela trumpets a popular part of South African football culture.Source: BBC