Now showing items 1-15 of 15

    • Bud Fruitfulness and Yeild 

      Martinson, Timothy E.; Lasko, Alan; Bates, Terry (Cornell University, 2012-05)
      Bud fruitfulness is determined early in bud formation, starting around bloom and continuing through about 30 days after bloom during the previous growing season. Shaded buds are less fruitful than buds from canes exposed ...
    • Fifteen Years of Vine Root Growth Studies in Concords 

      Lakso, Alan N.; Eissenstat, David M. (Cornell University, 2012-11)
      Using a miniature camera lowered into the root zone, Cornell physiologist Alan Lakso and Penn State root biologist David Eissenstat tracked seasonal growth of fine Concord roots over several growing seasons. Here is a ...
    • How Grapefine Flowers Form 

      Martinson, Timothy E. (Cornell University, 2018-11)
      Flower and inflorescence development is a two year process, often starting around bloom when primordia in developing buds commit to becoming either an inflorescence or a tendril. Branching is largely complete by veraison, ...
    • How Grapevine Roots Grow 

      Martinson, Timothy E. (Cornell University, 2019-08)
      The roots of the grape may be difficult to see, but they are equally as important as the above ground grapevine for management and vine health. Extension specialist Tim Martinson explains root biology and seasonal growth ...
    • How Grapevines Reconnect in the Spring 

      Martinson, Timothy E.; Goffinet, Martin (Cornell University, 2012-03)
      In midwinter, buds are isolated from the rest of the vine's vascular system. Signals from the buds reactivate the vine's vascular cambium, reconnecting shoots, trunks, and roots - a process starting at budswell and ending ...
    • How Grapevines Respond to Water Stress 

      Martinson, Timothy E.; Lasko, Alan (Cornell University, 2016-08)
      Leaf stomata open and close to regulate water vapor and CO2 exchange. When drought stress causes closure, photosynthesis and evaporative cooling stops. Prolonged deficits cause leaf senescence, ripening delays, and carryover ...
    • How Radical Manipulation of Sources and Sinks Affected Riesling Yield, Bud Hardiness, and Return Crop 

      Martinson, Timothy E.; Kallas, Raquel; Chen, Ray; Van Zoeren,Janet (Cornell University, 2019-05)
      In 2017, we defoliated, defruited, and severely pruned mature Riesling vines to radically alter source/sink relationships.  Here's what we learned.
    • Manipulating Cluster Size at Bloom 

      Martinson, Timothy E.; Particka, Chrislyn (Cornell University, 2015-11)
      Tim Martinson and Chrislyn Particka discuss limiting fruit set to reduce "cluster compactness" of tight-clustered grape varieties prone to Botrytis fruit rots.
    • Missing Parts: The cost of missing cordons, canes and vines 

      van Zoeren, Janet; Martinson, Timothy E.; Caldwels, Donald; Walter-Peterson, Hans (Cornell University, 2020-03)
      We surveyed 61 Finger Lakes vineyards in 2019 to find out how many missing cordons, buds, and vines there were in each block, and what these 'missing parts' might be costing growers.
    • Resource Assimilation and Vineyard Productivity 

      Bates, Terry (Cornell University, 2010-04)
      Viticulture is about capturing sunlight and soil nutrients and converting them into organic compounds for fuel and growth.
    • Sources and Sinks: Allocation of Photosynthates during the Growing Season 

      Martinson, Timothy E. (Cornell University, 2010-11)
      Carbon produced through photosynthesis is allocated to different tissues at different times in the growing season.
    • Untangling the concepts of vine size, capacity, crop level, vigor, and vine balance 

      Lasko, Alan (Cornell University, 2013-03)
      Vine size, vine capacity, cropping level, vine vigor, and vine balance are all related concepts describing vine productivity. They are commonly—but not always consistently—used. Horticulture professor Alan Lakso defines ...
    • Variable-rate Mechanical Shoot Thinning in Concord Demonstrates the Practical Application of Precision Viticulture 

      Bates, Terry; Jakubowski, Rhiann; Taft, Ted; Sprague, Dan; Joy, Andy; Martin, Madonna; Ebert, Scott (Cornell University, 2020-08)
      Research associate Terry Bates and GIS specialist Rhiann Jakubowski used variable-rate mechanical shoot thinning based on NDVI data to create a giant "C" in a Concord block at the Cornell Lake Erie Research and Extension ...
    • Vine Balance and the Role of Vineyard Design 

      Wolpert, James (Cornell University, 2014-12)
      Vine spacing is an important design consideration for new vineyards - and can profoundly affect management for the life of the vineyard. Jim Wolpert,  UC Davis, outlines how vine spacing and shoot number affect vine growth.
    • Will effects of the 2016 drought carry over into 2017? 

      Martinson, Timothy E.; Lasko, Alan; Koeberle, Alex (Cornell University, 2017-03)
      After a severe drought in 2016, many area growers are now wondering how this might impact the 2017 growing season.  Although this is a difficult question to answer, this article poses a few scenarios for vineyard managers ...