Studies may find new uses for grape skins, seeds, pulp
wine production and finding a second life for winegrapes. “Up to this point,” Barile said, “char- donnay marc has been regarded as a byproduct of winemaking with little or no value. Early results are encour- aging that marc could be a valuable source for oligosaccharides and oth- er compounds that support heal th and nutrition.” Although more research remains to be done, she said, “early results are promising that chardonnay marc can become a source for developing sup-
plements and other food products to support health.” The chardonnay pomace used in the study was provided by Jackson Family Wines and Sonomaceuticals, a company with the objective of finding new uses for viticultural byproducts. Winegrape marc comprises about 30% of the original winegrape material , and much of it is left to decompose in the sun. The s tudy i s ava i l ab l e a t www. sciencedirect.com by searching for its title, “A second life for wine grapes.”
Food scientists at the University of California, Davis, report they may have foundnewways to repurpose some of the byproducts of the winemaking process. California wineries crush around 4 million tons of winegrapes annual- ly, and with that comes thousands of tons of grape skins, seeds, stems and pulp. The UC Davis researchers stud- ied chardonnay winegrape pomace and found potentially health-enhanc- ing compounds and sugar molecules cal led ol igosaccharides, which are found in many plant and animal tis- sues, including human breast milk. “We were surprised by the diversity of the oligosaccharides in the chardonnay winegrapes, including the presence of structural elements found in mother’s milk,” Amanda Sinrod, lead author, said in a statement. Oligosaccharides appeared to be espe- cially abundant in the winegrape skins, UC Davis said. In earlier research, sci- entists detected oligosaccharides in the finishedwine, but not in large concentra- tions; researchers didnot include bottled wine in this study. The samples of chardonnay pom- ace, or marc, were also rich in flavo- noids, which the university described as healthy compounds found in many fruits and vegetables. Researchers said they are exploring whether the oligosac- charides work independently or syner- gistically with the flavonoids to support intestinal health. The team is also studying how grow- ing conditions, vintages and processing might affect the health potential of viti- culture waste.
“We observed significant differences in the relative abundance and type of oligosaccharides in different parts of the marc, so further research is needed to maximize their potential in food product design,” Sinrod said. UC Davis professor Daniela Barile said the research supports sustainable
HIT ME ALYBUG WITH YOUR BEST SHOT
Pests Continued from Page 10
the summer and fall, they move onto leaves and fruit. Vine mealybugs underground on root s or under bark on the t runk, cordon and canes remain a problem that creates a “refuge” from controls, Daane said. “Ants add another kind of biotic (or living) refuge by attacking enemies and creating a better ‘habitat’ under bark and underground,” he said. He ment ioned Givira, a genus of moths in the Cossidae family that is a wood borer that has been found in some older vineyards in Fresno County. He said nearly 100% of the vines with Givira had vine mealybugs with no parasitism. Ways of controlling the mealybug in- clude use of a systemic in May or June, followed by contact treatments. (Denni s Pol lock i s a repor t er in Fr e s no. He ma y b e c on t a c t e d a t agcompollock@yahoo.com.)
New Sequoia ® CA insecticide hits mealybug (and leafhopper) like a ten-ton brick. It comes from a unique class of chemistry – the sulfoximines – and has never been used in grapes. The different mode of action makes Sequoia CA an excellent rotation partner in full-season IPM programs with other classes of chemistry. And Sequoia CA fits perfectly into pest management programs that rely on beneficial insects. Mites aren’t flared and secondary pests stay… secondary. To learn more, contact your pest control advisor.
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April 28, 2021 Ag Alert 11
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