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Issue 22, August 2015


News from Cornell's Viticulture and Enology Program
August 31, 2015

Research Focus


New Insights on Hybrid Tannin Retention
Red wines made from interspecific hybrid cultivars are often low in tannins – even when the grapes have adequate concentrations at harvest.  Recent research shows that much of the tannin in hybrids binds to proteins and ends up in the lees, not the wines.

Tim Weigle

Five Questions for Tim Weigle

Based at the Cornell Lake Erie Research and Extension Laboratory, statewide grape Integrated Pest Management specialist Tim Weigle educates growers on pest management and carries out research on diseases and pests of grapes and hops.

Student Focus


Summer Scholars Program a Pathway for Students
Anne Repka ’17 studied black rot resistance in Bruce Reisch’s grape breeding program as part of the Geneva Summer Research Scholars Program – which provides undergraduates with firsthand opportunities to learn in the field and lab.

Grapes 101GRAPES 101

What Are Those Fungicide-Group Numbers on Product Labels?
Those ‘Fungicide Group’ numbers on labels provide growers with a tool to avoid selecting for fungicide resistance in their vineyards.


Second Compendium of Grape Diseases is New Resource for Growers
Originally published in 1988, an upgraded Compendium equips grape growers with the tools needed to diagnose a diverse range of vineyard issues. 




Tissue analysis is used to determine nutritional status of grapevines.  Leaf petioles are the tissue most commonly used for analysis, and in New York, samples are routinely taken at 70+ days after bloom.  In this Finger Lakes Grape Program video, Paul Sirois of Dairy One laboratories describes how samples are analyzed.

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