Organisers fear the giant London concert to mark the 10th anniversary of the death of Diana, Princess of Wales will be usurped by the Live Earth gig a week later.

News of the World reported that her sons Princes William and Harry were "desperately trying to rescue" the July 1 concert they are heading up at the new, 90,000-seat Wembley Stadium, fearing it will be blown out the water.

The Live Earth gig at Wembley on July 7, 2007 - one of at least seven such mammoth concerts across the globe aimed at highlighting climate change issues - will feature Madonna, the Red Hot Chili Peppers, Genesis, Duran Duran, the Foo Fighters, the Black Eyed Peas and Bloc Party among others. News of the World said alarm bells rang for the princes when the memorial concert organisers were forced to sign up 1980s Australian pop heart-throb Jason Donovan and American 1970s entertainer Donny Osmond.

"There is no doubt the Diana concert needs further big names," an insider told Britain's biggest-selling newspaper. "There is very little appeal to young people. With the exception of Elton, the acts aren't nearly as strong as Live Earth. Live Earth knocks it for six with virtually every cutting-edge, big-selling band in the world."

At the charity "Concert for Diana" on what would have been her 46th birthday, Elton John, who performed at her funeral, will play, as will her favourite band Duran Duran. British singers Bryan Ferry and Joss Stone and US rapper Pharrell Williams will appear, while composer Andrew Lloyd Webber will stage a medley of songs from his musicals and the English National Ballet will perform. Lloyd Webber is trying to recruit a big US star, News of the World said.

"The princes want the concert to be as much about modern-day trends as Diana's favourite songs and performers," the tabloid quoted him as saying. "I have pledged to make sure that vision is achieved."

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