By Chelsey Dulaney 

DuPont Co. on Tuesday trimmed its earnings outlook for the year, as weak demand in crop protection markets, lower corn area in Latin America and tepid soybean volumes weigh on its agricultural business.

DuPont is now forecasting operating earnings of $3.10 a share, down 10 cents from its previous forecast, excluding its recently spun-off performance chemicals division.

Shares of DuPont, down 12% this year, fell 1.6% to $55.80 a share in premarket trading.

The maker of Pioneer corn seeds has been hit recently by the strengthening U.S. dollar and low crop prices, as well as weakness in some chemical prices. DuPont is rolling out new and better products to help combat the foreign-exchange challenges, while hastening already-planned cut costs.

In January, the company boosted cost-cut targets and said it would reach its goal of slashing $1 billion in costs by the end of 2015, ahead of schedule, as it faced pressure from activist investor Trian Fund Management LP.

In the latest quarter, DuPont said cost cuts added 10 cents to per-share operating earnings.

"We continued to improve margins across most of our ongoing businesses through our constant focus on productivity, even as we address industrywide challenges in agriculture and ongoing currency headwinds," Chief Executive Ellen Kullman said.

DuPont in May won a victory over Nelson Peltz's Trian, which had been pushing management to streamline operations and potentially break up the company, when its shareholders rejected the firm's push to join its board. At the time, Trian said it would watch DuPont closely.

A spokeswoman for Trian had no immediate comment on Tuesday.

In all, for the period ended June 30, DuPont reported a profit of $940 million, or $1.03 a share, down from $1.07 billion, or $1.15 a share, a year earlier.

Excluding special items, operating earnings ticked up to $1.18 a share from $1.17 a share a year ago.

DuPont's total revenue fell 12% to $8.88 billion, while sales fell 11% to $8.6 billion.

Analysts polled by Thomson Reuters had expected a profit of $1.18 a share and net sales of $8.75 billion.

The U.S. dollar's strength against other currencies has made DuPont's seeds, crop sprays and chemical products more expensive for overseas buyers. Currency impacts brought down sales by 5% in the quarter.

Agricultural sales fell 11% to $3.22 billion amid a 6% drop in volume and a 5% currency impact. Operating profit fell 7% to $778 million, propped up by cost cuts and price increases from new products.

DuPont earlier this month completed the spinoff of Chemours Co., previously DuPont's performance chemicals division that made paint pigments and nonstick coatings for frying pans. That division posted $1.5 billion in revenue and $113 million in operating earnings in the latest quarter, both representing double-digit declines from the prior year amid lower prices for titanium dioxide.

As a result of the separation, DuPont said it now plans to purchase and retire $2 billion in stock by the end of the year.

Write to Chelsey Dulaney at Chelsey.Dulaney@wsj.com

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