TORNOTO (Bloomberg) — Canadian stocks fell for a second day, led by Suncor Energy, as a drop in wholesale sales reinforced concern that a stronger currency may be crimping exporters' profits. Goldcorp fell as bullion prices slid.Canadian wholesale sales fell 3.1 percent in April, the biggest drop in almost four years, Statistics Canada said. The decline, accompanied by slumps in exports and manufacturing shipments suggest Canadian companies are suffering from a 10 percent rise in the currency, to a 30 year high, since April, which has made sales abroad less profitable in Canadian dollars.

The Standard & Poor's/TSX Composite Index slid 141.33, or one percent, to 13,978.16 in Toronto. The benchmark has dropped 1.4 percent in two days from a record 14,176.42 reached June 18. It's still risen 8.3 percent this year on take-overs and higher prices for energy and other commodities

"The wholesale numbers are the biggest thing affecting the market," said Gavin Graham, who helps oversee about $5.3 billion as chief investment officer at Toronto-based Guardian Group of Funds. The "report suggests that the economy is being adversely affected" by the currency's strength, and "oil and gold are off a bit so we're seeing some weakness."

Gauges of energy and materials stocks declined 1.8 percent and 1.6 percent, respectively. They make up 43 percent of the S&P/TSX.

Suncor Energy, the world's second-biggest oil-sands producer, dropped C$3.06 to C$95.

Canadian Natural Resources Ltd., the country's second largest natural gas company, declined C$2.01 to C$71.44. The shares, which reached a record on June 18, were cut to "neutral" from "buy" at Merrill Lynch.

EnCana, Canada's largest energy company by market value, fell C$1.47 to C$68.90.

Crude oil for July delivery fell 1.3 percent to $68.19 a barrel in New York, dropping from near a nine-month high after an Energy Department report showed that US oil and gasoline stockpiles increased.