Raisin drying on vine
Gary Kazanjian  /  AP
Researcher Matthew Fidelibus at the UC Kearney Agricultural Center in Parlier, Calif., looks over raisins drying on the vine — a new technique to achieve a better taste and attract more customers.
updated 8/30/2006 10:38:31 AM ET 2006-08-30T14:38:31

Pity the poor raisin. It starts life as a middle-class grape and never attains the social status of its cousins — chardonnay, cabernet sauvignon and others destined to become fine wine.

But it may soon get a boost. University of California researchers taste-tested the sun-dried delights and asked consumers whether they prefer those dried traditionally on paper trays to those dried on the vine. They found the different methods produce subtle taste differences and preferences among raisin eaters.

Can raisin snobs be far behind?

"I could see someone doing raisin tasting at Whole Foods, or a recipe calling for a certain kind of raisin based on taste," said Matthew Fidelibus, a researcher at the University of California's Kearney Agricultural Center.

The testing — which looked at variations in fruitiness, chewiness and color — may offer California's $333 million raisin industry a new marketing angle to exploit.

Bouncing back
Although they produce nearly all of the nation's raisins and about 40 percent of the world's supply, California growers are just now bouncing back from a slump that saw record low prices between 2000 and 2003, Fidelibus said.

Large crops and low demand brought prices down, according to the California Raisin Marketing Board, said Karla Stockli, a spokeswoman for the marketing group. During the 2004-2005 season, when supplies stabilized and demand grew, farmers made $1,210 per ton, Stockli said.

Grape experts tested the raisins with 120 raisin eaters recruited on the UC Davis campus and found widely divergent fancies.

"The differences were fairly pronounced," said Hildegarde Heymann, a wine expert at UC Davis who also worked on the testing.

Researchers found that grapes dried on the vine were fruitier, softer and lighter in color. The ones dried on trays were a bit more sour, chewy and stickier.

And many liked them better.

"I think a raisin should have a certain amount of sweetness and caramel. The (dried-on-the-vine) raisins have the sour tannin flavor that you catch in some wines. I don't care for it," said farmer Earl Rocca, 78, who has grown raisins in Fresno since 1950.

"There will probably always be a market for tray-dried raisins, which is good for a lot of the mom-and-pop operations out there," Fidelibus said.

Many of the 4,500 growers in the south San Joaquin Valley would not be able to afford to switch over vine-dried grapes, he said.

About 90 percent of raisin farmers grow the Seedless Thompson, a grape that doesn't lend itself to on-the-vine drying. Growers would have to tear up their grapes and replace them with varieties such as those tested, the Selma Pete and Fiesta.

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And there are other drawbacks. Grapes on the vine take longer to dry, about a month versus as little as 10 days for those on paper trays, exposing them to potential rain damage.

But growers that can afford the machine to harvest them will reduce their need for workers, a shortage many farmers are bemoaning. About 55,000 workers are needed to harvest the region's 350,00 tons of grapes each year, Fidelibus said. And immigration crackdowns have made it harder for farmers to put workers in the fields this year.

Money isn't the only factor that may keep raisins on the ground.

Industry mired in old norms
The industry is notoriously old school. Raisins in California have been made in much the same way since the industry started about a century ago.

Workers cut the grapes in the summer and lay them out on paper trays. Small upgrades have come along every few decades. Grapes used to be dried on wooden trays until the 1960s, when the cheaper paper trays became the norm.

Dried-on-the-vine experiments began about 40 years ago, but it wasn't until recently that larger producers such as Kingsburg-based Sun-Maid Growers of California mechanized about 20 percent of its crop.

For several years, the company has offered a relatively small supply of vine-ripened raisins, available only through the online company store, said Barry Kriebel, Sun-Maid's president. The No. 1 use for raisins is in other products — cereals, cookies, snack bars.

Even the industry's advertising doesn't stray too much from the establishment.

It was only this year that the bonneted 90-year-old Sun-Maid girl became animated for the first time in a national ad campaign, explaining the ingredients for raisins: grapes and sun.

Fidelibus said he and others will continue researching raisin tastes.

"Maybe it won't happen tomorrow, but some day people may be looking for the perfect raisin to balance out a sweet pastry," he said.

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