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Title:   Author  item
                                            Warnock, Amyitem
                                            Baumgartner, Kendra
  Submitted to: American Society of Enology and Viticulture Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 4/17/2004
                                    Publication  Date: 6/29/2004
                                    Citation: Warnock, A.E., Baumgartner, K. 2004. Efficacy of vesta(r) as an organic soil inoculant for control of armillaria root disease of grapevines. American Society of Enology and Viticulture Annual Meeting Abstracts.Interpretive Summary: The objective of our research is to determine efficacy of Vesta  (Biologically Integrated Organics, Inc., Fresno, CA), an organic soil inoculant, for control of Armillaria root disease of infected grapevines.  In 2003, we initiated a field experiment in two Armillaria-infested North Coast vineyards.  Vesta was applied to entire vineyard rows via the drip-irrigation system.  Nontreated rows received water.  Healthy and symptomatic vines were randomly selected within treated and nontreated rows for data collection.  Treatment efficacy was assessed in terms of improvements in yield and growth parameters of vines that received Vesta .  As we previously found that symptomatic vines with Armillaria root disease have significantly fewer clusters, lower yields, lower cluster weights, and lower pruning weights than healthy vines, we assume that increases in these parameters among vines treated with Vesta  demonstrate treatment efficacy.  Vesta  was applied four times during the growing season.  Vesta  increased yields and cluster weights of symptomatic vines in one of two vineyards examined.  Treated, symptomatic vines maintained the same high cluster weights as healthy vines.  Analysis of soil nutrition among data vines showed that vines treated with Vesta  had significantly higher N, C, and CEC.  Enhanced soil nutrition, increased populations of antagonistic soil microbes, or improved water relations may contribute to efficacy of Vesta .
                                Technical Abstract: The objective of our research is to determine efficacy of Vesta  (Biologically Integrated Organics, Inc., Fresno, CA), an organic soil inoculant, for control of Armillaria root disease of infected grapevines.  In 2003, we initiated a field experiment in two Armillaria-infested North Coast vineyards.  Experimental treatments were arranged in a split-plot design with Vesta  treatment as the mainplot and vine status as the subplot.  Vesta  was applied to entire vineyard rows via the drip-irrigation system.  Nontreated rows received water.  Healthy and symptomatic vines were randomly selected within treated and nontreated rows for data collection.  Treatment efficacy was assessed in terms of improvements in yield and growth parameters of vines that received Vesta .  As we previously found that symptomatic vines with Armillaria root disease have significantly fewer clusters, lower yields, lower cluster weights, and lower pruning weights than healthy vines, we assume that increases in these parameters among vines treated with Vesta  demonstrate treatment efficacy.  Vesta  was applied at bud break, anthesis, 15% veraison, and 80% veraison.  Vesta  increased yields (P = 0.0757) and cluster weights (P = 0.0177) of symptomatic vines in one of two vineyards examined.  Treated, symptomatic vines maintained the same high cluster weights as healthy vines.  Analysis of soil nutrition among data vines showed that vines treated with Vesta  had significantly higher % N (P = 0.0306), % C (P = 0.035), and CEC (P = 0.021).  Enhanced soil nutrition, increased populations of antagonistic soil microbes, or improved water relations may contribute to efficacy of Vesta.


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