WASHINGTON (AP) — Federal Reserve chairman Ben Bernanke told Congress yesterday that the fragile US economy is being confronted by "numerous difficulties" including persistent strains in financial markets, rising joblessness and housing problems — despite the Fed's aggressive interest rate reductions and other fortifying steps over the past year.

At the same time, Bernanke, testifying before the Senate Banking Committee, sounded another warning that rising prices for energy and food are elevating inflation risks.

The situation, he said, poses "significant challenges" for Fed policymakers as they try to chart the best course for keeping the economy growing, while making sure inflation doesn't dangerously flare up. All the economy's problems, including slumping home values, which threaten to make people feel less wealthy and less inclined to spend in the months ahead, represent "significant downside risks" to economic growth.

Over the rest of this year, the economy will grow "appreciably below its trend rate" mostly because of continued weakness in housing markets, high energy prices and tight credit conditions.

Inflation has remained high and "seems likely to move temporarily higher in the near term", he warned.

Indeed, before Bernanke testified, the Labour Department reported wholesale prices jumped 1.8 percent in June. That left inflation rising over the past year at the fastest pace in more than a quarter-century.

"Given the high degree of uncertainty" about the Fed's economic outlook, Fed policymakers will need to carefully assess incoming information about inflation and economic growth, he said.