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Issue 37, May 2019

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News from Cornell's Viticulture and Enology Program, May 2019

Defoliated RieslingRESEARCH FOCUS

How radical manipulation of sources and sinks affected Riesling yield, bud hardiness, and return crop

In 2017, we defoliated, defruited, and severely pruned mature Riesling vines to radically alter source/sink relationships.  Here's what we learned.

NEWA website screenshotEXTENSION FOCUS

The positive impacts of NEWA for grape producers

The NEWA decision support system has been functional since 2007, and a 2017 survey shows positive impacts for grape growers in terms of reducing sprays, avoiding crop loss, and more.


Five Questions for Jennifer Russo

Jennifer Russo was recently appointed viticulture specialist with Cornell Cooperative Extension’s Lake Erie Regional Grape Program, and previously was a research technician for the Efficient Viticulture project.

Libby CieniewiczSTUDENT FOCUS

Elizabeth Cieniewicz: From summer scholar to red blotch scholar

Elizabeth came to Cornell AgriTech in the undergraduate summer scholars program, and returned to pursue her PhD. Her recently-completed PhD project with Marc Fuchs is providing new insights on Red Blotch virus management.

Grapevine with curled, yellowing leavesGRAPES 101

How important are grapevine trunk diseases in New York?

Trunk diseases can lead to blind buds, dead cordons or ‘dead arm’, reduced vigor, and ultimately missing vines. They've been receiving a lot of attention in other growing regions. How important are they here?


Red blotch virus symptoms on grape leaves and berriesA rapid, sensitive and inexpensive method for detection of grapevine red blotch virus

Detecting red blotch virus in a vineyard is now possible using a new technique called “Loop-mediated isothermal amplification” (LAMP), a simplified testing method that doesn’t require DNA extraction, costs less than a dollar per sample, and can be completed within an hour.


downy mildew hyphae on a grape leaf disk

Construction of a high-density linkage map and QTL detection of downy mildew resistance in Vitis aestivalis-derived ‘Norton’

By combining single nucleotide polymorphisms (SNP) and simple sequence repeats (SSR)markers, a genetic locus was found that contributes 34% of the phenotypic variance in Norton-derived grapevines’ resistance to downy mildew.


Digital Viticulture Logo
July 16 - 18, Shaulis Symposium and Vineyard Demonstration tour at ASEV-ES focus on Digital Viticulture 
New sensors, GIS mapping, and variable rate equipment will allow growers to manage individual areas within vineyards differently. The field tour (July 17) and Nelson J Shaulis Symposium (July 18) will address how to evaluate and integrate these tools for improving vineyard management and profitability.



Scheid Shoot Thinning Demo - LERGP Podcast #115. This video shows a demonstration of variable rate mechanical shoot thinning in a California Central Coast Pinot Noir vineyard. There is also a second video in the series -- Lodi Gallo Shoot Thinning Demo.