Harvests of Thompson seedless grapes, using both traditional paper drying and overhead trellis systems, should mostly be wrapping up this week, says George Zhuang, Fresno-based University of California Cooperative Extension viticulture advisor. “Last year was such a disaster, with low tonnage,” he tells Western Farm Press. “This year is a little better. Compared to the historic average, it’s a little less than average.”
Bearing acreage of grapes grown for raisins has been on a steady decline, from 273,047 in 1999 to an estimated 149,197 last year. The shrinking acreage is pushing up prices; Barserian says he has heard instances of companies offering growers two-year contracts at about $2,000 a ton, which would be significantly higher than the $1,100 per ton growers got in 2016 when the industry was trying to pare down an oversupply of California raisins.
Thunderstorms dropped as much as a half-inch of rain in some vineyards just as grapes were drying on the ground, causing millions of dollars in losses for growers. Rain can make raisins drying on paper trays dirty or moldy, sometimes requiring extra processing or reconditioning at the packing plant to clean them. Also last year, the heat and some instances of bunch rot combined to weaken grapes and leave them more vulnerable to rain damage.
This year, some growers had a rough time with powdery mildew, which can affect quality and yield, and there were reports of bunch rot, Zhuang says.
“Generally speaking, this year has been a pretty smooth harvest,” he says. “The only concern right now is, we’ve been getting such cool temperatures.”
Afternoon temperatures in Fresno since Sept. 12 have been topping out in the high 80s, although highs this week were expected to creep back up into the mid-90s, according to the National Weather Service.
“It’s been so mild,” Zhuang says. “People were concerned there’d be a delay in drying some varieties. But overall it should be smooth.”
Source: Tim Hearden, Western Farm Press
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