WASHINGTON — Wholesale prices plunged a record amount in October as energy prices fell by the largest amount in 22 years.

The Labor Department reported Tuesday that wholesale prices dropped by 2.8 percent in October, the biggest one-month decline on records that go back more than 60 years. The previous record holder was a 1.6 percent fall in October 2001, the month after the terrorist attacks.

The overall decline in the department's Producer Price Index was bigger than the 1.8 percent drop analysts had expected. However, core inflation, which excludes energy and food, was not as well-behaved, rising by a bigger-than-expected 0.4 percent.

The 0.4 percent rise in core inflation did not alter the view that plunging energy prices and a sharply slowing economy were combining to slash inflation pressures.

Analysts said much of the jump in core prices reflected the lingering impact of the huge rise in energy costs earlier in the year and should retreat in coming months as those costs continue to fall.

Ian Shepherdson, chief U.S. economist at High Frequency Economics, predicted that core wholesale prices would retreat significantly in coming months.

The 2.8 percent overall decrease marked the third straight month that wholesale prices have fallen.

Many economists believe the economy has fallen into a recession that could be the worst downturn in more than two decades. The expectation is falling inflation pressures will give the Federal Reserve room to cut interest rates further to combat the downturn.

The Fed cut interest rates by a half-point in a coordinated move with other central banks on Oct. 8 when the turmoil in financial markets was gaining intensity and followed with another half-point reduction on Oct. 29.

That pushed the target rate for the federal funds rate, the interest that banks charge each other, down to 1 percent, matching a low seen only once before in the past half-century.

Many economists believe the Fed will cut the funds rate again when officials hold their last regular meeting of the year on Dec. 16.

The PPI report showed that energy prices dropped by 12.8 percent in October, the biggest one-month fall since a 14 percent decline in July 1986.

All types of energy showed big declines with gasoline falling by a record 24.9 percent, surpassing the old mark of a 22.1 percent drop in March 1986.

Home heating oil prices were down 9.6 percent, natural gas intended for home uses fell by 5.9 percent, and liquefied petroleum gas dropped by 27.6 percent, the biggest decline in more than three decades.

Light, sweet crude for December delivery rose slightly Tuesday morning after falling $2.09 to settle at $54.95 a barrel Monday, the lowest since January 2007. Prices have fallen more than 60 percent since reaching a record above $147 a barrel in mid-July.

Food costs edged down 0.2 percent last month, as declines in the price of milk and meats offset a big jump in vegetable prices.

Excluding food and energy, the 0.4 percent increase in core prices reflected higher costs for light trucks, the category that includes sport utility vehicles. The price of tires, civilian aircraft and malt beverages also were higher, although the cost of passenger cars fell by 1.7 percent.