Frosty Grapes
The Northwest definitely isn't the only part of the country where frosty weather is impacting agriculture. Here's some news from our neighbors to the south.
The worst spring cold snap in more than 30 years is threatening to wreak havoc on the wine industry as three recent days of frost have killed grapevine buds up and down the crucial California vineyard region.
So far, grape growers estimate that as much as 10 percent of their crops could be lost, an unusual occurrence in an industry that hasn't seen a significant spring frost since the early 1970s. But the real impact won't be known until June, when the first grapes start to actually show and farmers can take a count of what they expect to harvest.
For now, all they can do is hope no more freezes occur so their vines can recover by pushing out new shoots to replace the ones that were killed.
"This is the worst frost season I've seen since I started in this business in 1971," said grape grower David Steiner, who also is a soil conservationist with the Napa County Resource Conservation District. "It's kind of hard to tell exactly what's going to happen. It's a little worrisome."
Ten percent would cost the industry $100 million in revenue.
The most damage to vines took place March 31 and last Saturday and Sunday, when temperatures dipped below the freezing point of 32 degrees to as low as 27 degrees throughout the region.
In checking the daily record lows in both Napa and Santa Rosa for March and April, most of them are at or a bit below freezing. The cold this year has been surprising to many folks because almost none of those record lows were set after 1970. The average lows this past month in California wine country--and for that matter much of the West--have certainly been below average.
Continuing with the original article...
The snaps could not have come at a worse time, because this is when the first tender shoots of leaves and flower clusters that eventually produce grapes are pushing forth. They die if they freeze because their cells expand in the cold and burst.
This doesn't kill the vines, so if they can avoid more cold, they will produce a second growth of shoots, or buds. And though those often contain only half the grapes of the original shoot, there is no loss in quality once they fruit.
But that won't happen for another two to four weeks. It's nail-biting time until then.
...
Among the hardest-hit areas were Sonoma County vineyards in valley locations such as Dry Creek and Alexander, where cold air became stationary, inflicting the most damage. Farmers usually turn on their frost-protection machines a couple of times a year when the thermometer dips below 40 degrees, but so far this year some said they have had to activate them as many as 30 times.
Before this year, frost had affected the vineyards of the North Coast to this extent only in 1971 and in the late 1940s, growers said. A statewide cold snap in 2001 sent a scare through the industry, but the vines managed to recover enough to produce a crop only slightly smaller than usual.
Hopefully the growers got lucky.



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