Research Reports

Since the establishment of the Lodi Winegrape Commission in 1991 one of its primary goals has been to fund research that provides Lodi growers with tools for improving winegrape quality in an economically viable way. Over the years scientists at the University of California and California State University have received grants from the Winegrape Commission to work on many topics such as pest management, irrigation management, and vine nutrition management. In an effort to make the results of this work available to all Lodi growers, reports from this research are posted here so they can be read on-line or downloaded and saved for later reading and use. When new reports of currently funded projects are submitted to Lodi Winegrape Commission they will be posted here.

VITICULTURE:
Vineyard Nutrition Management:
Soil specific potassium management in the Lodi winegrape region. Dr. Stu Pettygrove’s report from his first year of research (2006). The goal of the three year project is to provide Lodi growers with potassium management recommendations based on the soil type present in the vineyard.
Dr. Stu Pettygrove’s report from his second year of research (2007).
Irrigation Management and Wine Quality:
Deficit irrigation of quality winegrapes using micro-irrigation. Terry Prichard’s 2004 handbook on deficit irrigation for improving winegrape quality based on many years of research in Lodi.
The interaction of deficit irrigation and extended maturation (hang time) on vine health, fruit yield and quality of Syrah in 2005. A February 2006 report by Terry Prichard and others.
Irrigation management of Merlot to modify vine and wine characteristics. A 2000 final project report by Terry Prichard and Paul Verdegaal.
Irrigation management of Zinfandel to modify vine and wine characteristics. A final project report by Terry Prichard and Paul Verdegaal. (file name: Prichard Zin Compr Report 2000)
Vegetative effects of long term water deficits on Cabernet Sauvignon. A 1998 final project report by Terry Prichard and Paul Verdegaal.
Fate of Nitrogen from Cover Crops:
Uptake of nitrogen from cover crops by winegrape vines in Lodi vineyard. The second year project report by Alison Berry.
Uptake of nitrogen from cover crops by winegrape vines in Lodi vineyard. The first year project report by Alison Berry.
Effects of Cover Crops on Microbial Communities in Vineyard Soil:
Edwards, M. and K. Scow. 2001. Effects of different kinds of cover crops on the microbes in Lodi vineyard soils. A final project report by Margaret Edwards and Kate Scow.
Soil Microbial Inoculation:
Effects of inoculating soil with microbes on Zinfandel winegrape performance and water relations. A 2004 report by Terry Prichard and others.
PEST MANAGEMENT:
Fan leaf virus:
Evaluation of fanleaf-resistant rootstock selections for use in the Lodi region. A 2003 report by Andy Walker and Paul Verdegaal.
Mating Disruption for Omnivorous Leafroller:
Using pheromone confusion (mating disruption) to control Omnivorous leafroller. A 2001 report by Chuck Ingels.
Eutypa Dieback:
Influence of vine training systems, pruning practices, and soil types on Eutypa dieback incidence and severity, viticultural performance, and wine quality in Cabernet Sauvignon grapevines. A final project report by Sanliang Gu and others.
Effect of training-pruning regimes on Eutypa dieback and performance of Cabernet Sauvignon grapevines. A 2005 publication in the Journal of Horticulture Science & Biotechnology of Sanliang Gu’s long-term work in Lodi on Eutypa dieback.
Grower Surveys evaluating LWWC’s IPM Program:
A report by Jeff Dlott summarizing the results of the LWWC IPM Program grower surveys carried out in 1998 and 2003.

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