Singapore: At the end of last year, rice was selling at $13.865 per £100, the Philippine central bank had met its inflation target for the first time since 2003 and the peso was the world's second best-performing currency.

By April 1, rice was surging toward a record $21.60, the inflation rate had almost doubled, and the peso suffered its biggest monthly decline in seven years.

Record prices for rice, wheat, milk and cooking oil are wreaking havoc with currencies in Southeast Asia, causing a slump in the peso and Indonesia's rupiah. Investors from Deutsche Asset Management to Fortis Investments are dumping their bondholdings on concern inflation will erode returns, putting further pressure on exchange rates. The region has come to depend on strong currencies to contain the rising cost of food and fuel imports.

"You can't just rely on currencies to fight inflation, as there comes a time when they have no potential to appreciate further,'' said Nicolas Schlotthauer, a money manager who helps oversee $5 billion at Deutsche Asset Management, part of Germany's largest bank, in Frankfurt.

"Everyone is so complacent about the fact that if there's inflationary pressure, they will let their currencies appreciate. No one thought of potential currency weakness.''

The Philippine peso tumbled 3.2 per cent in March, the most since June 2001. It fell 0.4 per cent to 41.750 by the close of trading in Manila, according to data from the Bankers Association of the Philippines. That's a reversal for a currency that gained nine per cent in the fourth quarter, second only to the Armenian dram.

In Indonesia, the central bank probably bought more than $2 billion of rupiah, limiting its decline since March 1 to 1.1 per cent, according to Oversea-Chinese Banking Corp., Singapore's third-biggest bank. The rupiah slid 0.3 per cent to 9,200 per dollar in Jakarta by 5.30pm local time.

International investors cut their holdings of Indonesian government bonds 3.2 per cent in March to 80.7 trillion rupiah ($8.8 billion), according to finance ministry data. Foreign funds sold a net $154 million of stocks in the Philippines this year, helping drive the Philippine Stock Exchange Index down 19.5 per cent.

Deutsche Asset sold all its rupiah debt earlier this year and didn't buy peso bonds because of inflation, Schlotthauer said. Fortis Investments expects the rupiah will weaken 3.2 per cent to 9,500 per dollar within three months.